If you like the default GNOME way of doing things, it’s alright. If you don’t - no amount of extensions will help.

Not to mention Gnome is monolithic, so any bug will immediately crash the whole desktop. Other than basically any other desktop compositor, window manager and desktop environment are tightly intertwined, so any extension (which still monkey-patch code directly into gnome-shell) can utterly break the whole thing to the point you don’t have a graphical interface anymore.

Compared to KDE, Cinnamon and others (who can have their whole desktop crash without taking any applications with it as long as the window manager etc. and drivers remain unaffected, usually trying to restart the DE and spawn e.g. Dr Konqi) Gnome loves to be unstable because of this. If Gnome crashes it takes everything with a GUI with it.