Actually Manjaro-Architect nullifies all the steps. Everything my howto describes can be done in M-A. It’s just a very good installer and totally underrated.
Too bad it only installs Manjaro 
so
I would also really be interested in hearing what you experienced. This project would surely benefit from an installer with more (working) options.
Manjaro-Architect is basically just a bunch of bash scripts forked from the Architect Linux installer by Carl Duff.
I had a quick look at some of the scripts; it shouldn’t be too difficult to adapt them for a different distribution. Just a ton of work, so as long as I can set up my preferred encryption scheme manually (LVMonLuks with seperate /home and hibernation file) in about 15 minutes I certainly won’t be doing this.
But there’s a reason Manjaro offers Manjaro-Architect alongside Calamares. I hope I’m wrong and it certainly is still early on and I should give it more time, but I don’t believe the upcoming calamares net-installer will (ever) cover the needs of some hard-to-please (like me). So the EndeavourOS team may eventually have to provide some other installer in the future also.
(Please understand the following isn’t meant as general critic; I’m really happy with this young project at this stage but I believe some things need to be addressed in the future).
On the one hand EndeavourOS wants to provide an easy GUI install,
because users are expecting the GUI approach as Bryan put it, even to an arch newbie, but then doesn’t provide any means to search and install software per GUI. So once installed they then want a new arch user to get used to doing stuff in the terminal. Somehow doesn’t feel right.
Is a TUI-installer (that actually gets things done) really that scary and off putting to new users?
I get it that the devs wanted to get this project started with a working iso and that calamares was an easy way to set this up in a time frame they set themselves but I don’t understand the main focus on calamares in the foreseeable future. Unless they are doing some really heavy modifications upstream. In every discussion I have followed (this forum, Telegram) that point out potential alternatives, it (the/a dev) always comes back to calamares or the upcoming calamares net-installer. But this will probably only let you choose something else than XFCE and still not let you install/combine BTRFS, LVM, LUKS etc.
But, early days; I’ll give it time. Really like this project so far!