gnome devs would realey really like it if you didn't use extensions
This is patently untrue. The GNOME developers even maintain their own repository with a bunch of extensions for people to use. Why would they do so if they didn't want anyone to use them?
Do extensions break on GNOME major version upgrades? Sometimes, yeah. Nobody is forced to upgrade if they don't want to, and it's not like you log into your desktop one day to be surprised with a broken system. There's even an upgrade assistant that will tell you prior to an upgrade if any extensions will break.
This pervasive loud minority of whiny complainers spreading nonsense about GNOME is annoying. It's free software; don't use it if you don't like it, that's fine. But don't spread lies about it, that's childish.
Jeez. Sounds like Roblox is horribly designed if the only way they can secure their servers is through client side measures.