It really depends on what you want. My experience with Gnome extensions has been rather frustrating. For example, finding a working and maintained extension for app indicators is a pain - and you have to do it again for each new release when inevitably the extension is no longer updated.
That doesn’t mean anything. If you have tons of free RAM, programs tend to use more than strictly necessary because it speeds things up. That doesn’t mean they won’t run perfectly fine with 8GiB as well.