I don't know about you, but I really don't want an extension for every small change one might want to apply to one specific site.

That's fair how about Tampermonkey -- I use it occasionally to apply js/css/html fixups to sites, e.g. Add browser titles to sites for better bookmarks, re-organize/add site html, etc. I did use it for removing content but ublock origin is much better imo for most cases.