I think you have to include Office in the list of things they used to do "right" or at least in a way that supported their business. Notably Excel, which used to be the absolutely most usable spreadsheet that there was. IMO Word peaked with Mac version 5.1, but it used to be pretty good too. Both are now more difficult to use than LibreOffice, and also have more stupid bugs. The one that keeps irritating me with Word lately is saving a document which ends in a list. If and only if you leave the cursor on the last character of a document like that, it will add another (blank) list item AND another paragraph after it when you save. Not sure if this only happens on a quit save or not, I haven't bothered to find out, but either way it's fucking trash.
Anyway, ahem, the point is that Windows and Office had synergy. TBF though, some of that was skullduggery. Specifically, Microsoft was caught using internal functions for Office apps, where the public (published, documented) functions were literally the same functions but with a delay loop. If they had been the same function but with a semaphore they might have had a valid argument about being more familiar with their internals, but that was just obvious anticompetitive fuckery.