I don't use gnome and after switching to hyperland prefer not to have my compositor draw anything other than windows, so I can understand where you're coming from, but for gnome i'd want to keep it, namely cause its used for:

• System controls including power/logout are there as well as switching audio devices through an extension.
• clock
• system indicators (what else are you going to do about applications that unmap their window on close, like discord?)