Contrary to what many people thing, Gnome is extremely modular and customisable. It's just not really exposed in the base Desktop Environment itself.

You can do literally anything with the extension system. It's very powerful.

That does however mean that you can easily break things, which is why by default Gnome marks extensions as unsupported when a new Gnome versions come out, until the maintainer adds a text string inside the extension that flags their extension as being validated for the new version.

You can disable the version checks, of course, and just risk it. But usually I find you don't need to. By the time a new release comes out, the Gnome beta has been available for over a month, and the extensions have already been updated in advance.