"title bars that made it impossible to tell active and inactive windows apart": Win10 (and iirc Win 7, I never had Win8) are a mix-and-match. FreeCommander XE (the file manager I use) and Thunderbird both have title bars that change color, and Vivaldi allows it (although the contrast is not as great as I prefer). But none of the MsOffice apps do. I
think there's some kind of subtle change they do, maybe a 1 pixel wide border or something that shows up when they have keyboard focus, but I honestly can't tell. As a result, I not infrequently type into (or worse, delete something) from the wrong window.
Also, the title bars on MsOffice apps are so cluttered with controls that you can hardly find a safe place to click on them if you want to select that app with your mouse. Why, for example, is the search bar in Outlook up there, instead of some pop-up dialog box? (And the Outlook and Word search tools themselves are a mess, but I digress...)