Especially incremental updates. It already blew my mind that they broke the API so frequently with GNOME 3, the fact that they're still abusing extension developers like that in 2022 is unfathomable.
It’s one of the reasons I don’t look forward to upgrading my Linux install at all.
Arc menu, emoji picker, Dock extensions were something I used a lot and had to wait a while before they were compatible with certain Gnome versions. Emoji picker still isn’t, had to switch to Smile the flatpak package to make it work.