Linux as a whole is customizable. Nothing stops you from installing Plasma on Linux Mint and then theme it heavily, much like how nothing stops you from installing Cinnamon on Arch and making it look like Linux Mint.
Correct me if I’m wrong, but Debian based distros offer the latest drivers without much hassle on your part.
Then update once a month and set up btrfs and REISUB
This will be a major problem. Package management on Arch is exclusively through the terminal. The reason, to me, doesn’t seem that clear. It seems more like this is just how Arch has always done things, so this is the way things will always be done.
Whenever I installed Arch Linux, I used a tutorial from ItsFoss or archinstall, not the wiki guide. The wiki guide goes into a lot of details and I have found it very confusing and difficult too. It will be good to check the wiki first, since for most things, it is structured more like a tutorial than a piece of documention, but I understand your POV.
If you don’t think you will enjoy EndeavourOS, look at Fedora or a Fedora based distro. It will provide a similarly stable and user friendly experience as Linux Mint.