Apple always have wanted full control, that’s the reason why they ended using Nvidia, so this step isn’t a surprise. Also I think they want to be more exclusive, so having a custom chip means the end of Hackintosh (for now) and installing other OS-es on their machine.
If you want the Mac experience, buy Apple hardware, is what they are going to tell all of us.
And if you want the EndeavourOS experience, install it, havn´t any problems and have fun with it. 
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EndeavourOS Is “All about the Experience” you have to Endeavour to feel it! 
Edit: @Bryanpwo I feel a theme coming on here!
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I don’t think Apple switched to ARM because it got tired of the security issues with Intel processors.
Ok, nobody said that was the reason. They were small part of it
Yet that would really justify the transition. Security is one of the most important aspects.
as also they builded there own factory to build the arm processors thats creates jobs and some money from the gouvernment.
More control to there hardware also. A regular cheap fix would be much expensiver also.
current ARM processors are rebranded when they come with there own, would become a inhouse build.
All the current A-chips in iPads and iPhones are custom made and built by Apple. They are not just “rebranded”.
a saw in the wiki is designed 
but not build by apple.as wiki ; but that gona change.
ARM isnt innately more power efficient this is a bit of a fallacy, ISA these days arent THAT incredibly different and RISC/CISC isnt much of a thing anymore (in this specific context) as ARM has ballooned up to be more similar though still leaner than x86. x86 has the ability to be scaled down to very low power levels just as ARM does. ARM CPU are frequently built with Small form factor low power systems in mind with a specific eye for lower power usage. Looking at more efficient Atom designs like the z8350 you see some really impressive performance vs power consumption but Atom in that regard is pretty well dead as intel couldnt dent the ARM design dominated mobile space.
ARM isnt a catch all for power figures and performance across the type of CPU it implies either as ARM designs are licensed then changed significantly by licensees to fit within performance and power targets. You can have an ARM CPU that chugs power or sips it depending on the intended targets.
The comparison though isnt a 1:1 as ARM vs x86 you do not have feature parity and this is all going to depend entirely on what your intended workload is. Some things being executed on ARM can take much longer due to lacking certain accelerated code paths and having to take the long way around. The average user on facebook and such this isnt an issue but this boils down to “what are you doing”? Float performance for instance on ARM is lower (much better than it use to be). The Current crop of ARM CPUs get absolutely obliterated in Float. Doesnt mean theyre not good, just that specific workload.
Apple isnt going ARM for some “power efficiency” reason or some reason about bringing a better customer experience, altruistic motivations are not even on the table for them. If that was the case theyd have had decent cooling in their laptop lines or designs that didnt make your head hurt (putting the display power line next to the CPU data line) for years but they havent. Apple has only one concern in this instance and that is to control the product from top to bottom, CPU/GPU, Software, etc. and to control who can get what repaired where and when. Theyve been working towards this for like 15yrs or more.
Its already been said but no Apple chips arent rebranded. They license the ARM ISA which means it executes ARM instructions but they design the chip themselves from the ground up. Their chips are very good, some of if not the best in mobile and theyve hired some serious talent to get the most out of it.
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ARM does power the most powerful supercomputer in the world now:
https://www.anandtech.com/show/15869/new-1-supercomputer-fujitsus-fugaku-and-a64fx-take-arm-to-the-top-with-415-petaflops.
Already mentioned by ricklinux
By this, are you meant to be a step backwards, a step forward, or a forward escape on the part of Apple?
So why is this innovative for Apple?
Apple is taking total control of their product stack, its also innovative because theyre pretty much the only people to go full ARM across their ecosystem so this will likely accelerate ARM growth in the fututure. They will have direct control of all hardware and software on the system along with few if not nobody having parts for repairing apple systems.
Apple has been aggressively fighting right to repair and doing as much as possible to make it more and more difficult for anyone but apple to repair their products. This move is a means for Apple to gain more control which is something they like but itll have the added benefit of bringing ARM further into relevancy in the Desktop/Laptop/Server space which theyve largely been relegated to mobile most of their existence.
Itll be interesting, having pressure on AMD/Intel from more than just each other will push things forward.
None of that really describes the situation, Its not a step forward or backward really as much as them shrugging off a part supplier they couldnt maintain control of. Apple has been more than willing to strong arm/bully their part manufacturers and Intel isnt someone they could do that to. Apple wants control of the manufacturing, repair, and software across the board which will net them more $, with this they can do that as near everything will be custom.
What I think would be interesting is if Apple can pull off performance like Amazon’s new Graviton2. While power usage is roughly the same as Intel/AMD equivalents its able to provide competitive single/multi thread performance in int & float with a very integrated ecosystem
https://www.anandtech.com/show/15578/cloud-clash-amazon-graviton2-arm-against-intel-and-amd
Graviton 2 is absolute latest ARM design targeting server/infrastructure usage though. Its not exactly a client design so we will see
Well I don’t know what ARM will benefit from this. In the server market, I think Apple is not a significant factor yet.
Developer support, in mobile they have plenty but on desktop/laptop they’re lacking. Adobe and other major software developers will for sure increase support in that regard
Also hopefully they’ll see higher market share outside of mobile. Increased competition is good for everyone