sdgsdgsd what are you trying to accomplish? Are we talking about looks, performance, disk space? What is your community about?
Most new Flarum users complain that Flarum it too minimal 😅
You can run Flarum with just the core and no extension, but this probably won't meet your community's needs.
As discussed in other threads, you can usually install hundreds of extensions without running into any significant performance issue (unless using a badly implemented extension). And disk space is usually not a factor in today's world. The UI gets more cluttered the more features you add, but this heavily depends on which extensions you use.