The Control Panel. Yes, the Control Panel. How is it possible for a final, shipped product (8, 8.1, and now 10) to have multiple versions of a single app (the Control Panel) where some options are in one version and other options are in the other? And the UIs of each are completely different.
At least the Control Panel vs Change PC Settings options are now no longer shown together in the same pop open Charms menu as they were in 8.x. I suppose at least in 8.x they put one at the top of the menu and the other at the bottom of the menu, like there was some discussion to keep them far apart because, oh I don’t know, because having two different links to two different Control Panels in the same menu might be confusing to users.
Anyway, so the bizarre charms menu is gone. The Metro Change PC Settings app from 8.1 is replaced with a new app in 10 with some snazzy looking icons. But wait.. the Windows 7 style Control Panel is still in Windows 10? With the the previous Windows 7 UI style? Wait, what? So there’s still 2 different Control Panels in 10? Microsoft please, get your design teams in the same room!
More other bizarre observations and pet peevs in this post over at The Register.