Some more detail about the control that the new extensions button gives users: https://blog.mozilla.org/addons/2022/11/17/unified-extension...

It allows you to disable extensions only on specific sites. (And presumably, that's also the reason you need to dive into about:config to remove it: if you remove it, it's pretty hard for casual users to find out why an extension isn't working. By gating it behind about:config, people who are able to deal with that can still remove it without rendering casual users helpless. That's my personal interpretation though.)