If there wasn't a search function, I'd absolutely never figure out where anything is in there in Windows 10. It's an absolute mess.

Luckily it's one of the few things that actually work well in my experience.

Windows 11 still leaves a few things in the legacy Control Panel, but there's less that's only accessible there than there was in Windows 10, and every recent dev channel build has moved more things into the modern Settings app.

More importantly, they've gotten pretty good about linking into legacy Control Panel applets from the modern settings app-- so, even if a setting hasn't been migrated yet, you should be able to find a link to it in a logical place from the new Settings app. That's not new in Windows 11 (Windows 10 is pretty good about it too, for the most part), but the Settings reorganization in Windows 11 helped this along a bit.

W10 wasn’t pretty good at it, and something tells me I wouldn’t find my relevant settings quickly in 11 either. Settings reorganization never helped, I know this because never heard from my non-power-user friends or relatives “oh, I just went to settings and set it up myself, so convenient” even for easy things. It’s always arcane don’t touch it thing for them, every release. And every power user I know basically said “I can’t find shit after every damn release, why the fuck they do that every time???”.

There always will be because if you removed it people would freak out. Even though there are barely any settings left that you need to go there for.