What you might be missing is some complex technical reason why the mouse control panel cannot be easily migrated. For example, a lot of drivers integrate their own tabs into the mouse control panel for features.
The slow migration from control panel to settings is actually, in my opinion, one of the better ways Microsoft has done software development. We aren't waiting 5 years for them to migrate 20 years of settings and we aren't stuck with a limited version 1.0 product without sufficient features.