[type0]

> There are common desktop extensions that Gnome just isn't really interested in developing.

In GNOME 45 all current extensions will loose backward compatibility, that's one of the yet more changes that will force many to migrate to other desktop environments

[tadfisher]

There is a really good technical reason for that, and honestly, I don't want to use extensions that aren't being maintained as new versions of Shell get released.

The reason Gnome doesn't have a stable extensions API is the same reason extensions are powerful: extensions are user code running in the same JS environment as Shell and can do anything. I think that's a decent tradeoff for a best-effort system without a ton of manpower and ecosystem involvement.