From my experience "System settings" is bad name. From the beginning when it came to v4 I always have difficulty to find it in menu. This is because there is "System" submenu and "Settings" submenu, so there is no clear intuitive understanding what submenu to open. And I always get into "System" first (because "System settings" starts from this word).

Another reason IMO is that "System settings" is not correct at all, because it configures not OS. Well, it can at some degree, but does it not very well, so I did not use it this way.

What it configures mainly is desktop shell, so "System settings" is misses the point.

I think "Control panel" by Microsoft is best name that can be ever invented. Please, don't try to avoid same terminology just because some rival products use it. There is no copyright on names AFAICS.

Conversely, please try to use more names that are already used in other products. Thus you'll bring easiness to all people and that probably will be more interesting for new users.