Raymond Chen, a Microsoft blogger, has posted[0] about why Windows doesn't use an expert mode.
[0] https://devblogs.microsoft.com/oldnewthing/20030728-00/?p=43...
[0] https://devblogs.microsoft.com/oldnewthing/20030728-00/?p=43...
A recent Windows update even went so far as to proudly boast about how they were adding back menu items that had disappeared in this drive for stupidification of the menus. Hardly progress.
That's why they keep linking to the Control Panel, they're not there yet. I think they'll soon be done with the System page, for example.