I will translate that very surprising comment whom made my choice :
--start of comment--
[quote]does S76 announces they're targetting to recreate their own desktop from scratcch, or they "just modify things" whom are not really good with the gnome desktop of today, keeping the rest (running GTK if Im well)? [/quote]
Official communication(1) says "we're doing to do our own desktop because gnome extensions are too breakable". Indeed, Cosmic-desktop was until there a gnome modified, with extensions, whom can by definition(2) be bugged/breaked/misfunctionnal at each gnome update. This decision could be comprehensible for a company who install it on computers to sell.
But I think we might not forget the fuming writing(3) that Chris Davies published shortly afterwards. As explained, some S76 devs badmouth a bit regarding Gnome devs riding their bad reputation (not diserved at all imho) and of lost-minded nerds flooding the r/gnome subreddit and comments on OMGubuntu. The announce of Cosmic being rewrited in Rust has been then shown as a divorce between S76 and gnome, on the exclusive wrongdoing of that last one. It personnaly a view whom makes me sick, as some people said it here already. Budgie said more or less the same thing announcing last december they will re-write their desktop environnment in ELF(4), accusing the GtK project of being running for the particular interests of Gnome[teams]. It's very hard for me to see that as something else than a true and real bad faith. Few years earlier, Linux Mint and elementary, decided their own desktop environnment in replacement of Gnome, and the three projects has followed a distinct path while keeping a good harmony (and staying based on GTK!)
it's very frustrating to see those quarrels blocking on the path of the linux desktop adoption, because it's really about it : we're not talking here about niche desktops like sway or lxqt, but about what can permit to a huge amount of users to emancipate of microsoft and Apple. If it's still considered as a relevant idea.
1: omgubuntu.co.uk/2021/11/system76-is-building-its-own-desktop-environment
2: wikipedia.org/wiki/Monkey-Patch
3: linuxfr.org/users/anonyme/liens/system76-a-case-study-on-how-not-to-collaborate-with-upstream
blogs.gnome.org/christopherdavis/2021/11/10/system76-how-not-to-collaborate/
4: joshuastrobl.com/2021/09/14/building-an-alternative-ecosystem/
--end of comment--
this is the reason why, on my own, I litterally prefer LMDE, with openbsd and haiku to accompany.