Comment by zamadatix

I don't think the Fluent+Metro stuff is so different as to be a real consistency issue. Certainly minor inconsistencies that can be easily pointed out in a list but little that makes a typical user think "this is a completely different thing I'm using". The rest of the "old" stuff seems to have been made visually consistent in the 7 era even if the tools themselves originated from different eras with most gaining high DPI support and following the newer theming, again not a consistency issue in itself. There are a few REALLY old dialogs called by ODBC and maybe some others but I can't think of any you run into unless you're intentionally looking to run old software that will call them. So technically 3 but really 2 really noticeable UI environments in day to day.

I'm worried with 11 it'll be a repeat of Windows 10 where at the start you're constantly using "yet another UI". At this point it's nearly gotten decent to the point if you aren't a sysadmin (MMC, regedit, task manager, advanced control panel items not nowadays part of Settings) you rarely run into the "old" style stuff with the one exception of File Explorer. Hopefully it doesn't take another 6 years to be saying that about Fluent/Metro stuff being updated to match 11's new look.