It’s intentionally fucked by MS. It doesn’t matter that this non-MS software actually follows consistent standards. As long as its only the minority, they get away with it looking like it’s the others not being consistent.
MS has a history of doing it. It’s in the company ethos of “embrace, extend and extinguish”. Imagine something as simple as storing the contents of a document being at the behest of a private company. Humanity is all the worse for it.