It's likely that the last version of Windows where it all was consistent through and through was Windows 2000. Someone may correct me by bringing up an exe that ships with the currentest Windows and which looks unchanged from Windows NT 4.0.

I remember an article showing the UI of Windows system apps, and as you go deeper and deeper into %SYSTEM% or whatever, you get UI from progressively older and older versions that are sort of left behind. You get an incentive to polish all the immediately user-visible stuff, but there's so much of it anyway so if the deeper-hidden stuff that a handful of people is using is still working, nobody will touch it. Look, the WMI console was probably unchanged since Windows 2000 at the time of Windows 10.