The old dialogs used to be extensible, in that getting random software like mouse drivers to just add a new tab to the mouse control panel was the way to do thi

The old dialogs used to be extensible, in that getting random software like mouse drivers to just add a new tab to the mouse control panel was the way to do things. The new one is, as far as I know, not that. So there's a chance that they left random bits alone because they're afraid to break things. Or that's merely the justification to push back against the designers…