Everybody is a genius, but if you judge a fish by its ability to climb a tree, it will live its whole life believing its stupid.
As an answer on your first answer, the answer is no, because after install it basicly rolls Arch. If we have to withdraw updates, we would be more like MAnjaro and we are simply understaffed to do that. It also isn’t our vision to do that with EndeavourOS.
Endeavour is going to provide an easy installer for Arch, but will give you the same Arch experience afterwards, with a more than friendly community to help you.
There are some Antergos features that won’t be included in EndeavourOS, towards the end of the month we will inform you about the changes.
Like I said in the anouncement, we are not going to clone Antergos.
The problems you’ve described on Budgie and Mate are merely caused upstream (there’s a small chunk that has to do with Antergos repo). I don’t know if you noticed, but when a DE receives major updates, the packages come not all at once, but in chunks, making the DE break because it misses dependancies. Some DE’s suffer from this (Deepin, Gnome, KDE) more than others, because those are the DE’s that mostly have somewhat radical changes each major update.
This problem is coherent to rolling release distro’s, I’m afraid.
I agree with @ricklinux if you don’t know KDE that well it can be overwhelming, it sure is a DE that fits with Arch’s philosophy: A lot of possibilities, but you really have to dive into it. But once you’ll understand the magic behind it, it’s terrific to use.