Let me posit a situation.
Microsoft are very keen on the cloud; they like the idea of us never owning anything, of everything we use being registered and renewed every month. They've almost certainly got 1,000s of evangelists for the cloud within their organisation.
Also beavering away for Microsoft is the OneDrive team; they like the cloud, they use the cloud but they want people to use OneDrive and that means syncing data reliably, cheaply, quickly and all the other lies.
This is an anathema to the Cloud evangelists. "You want your data in two or more places?", "Really?", "How quaint.", "Well it's never gonna happen." "What ever you want, whenever you want it, you just download it."
You can see why things don't get fixed?
And talking about things never getting fixed, document preview in Office is still broken (and Jimmy Savile is still dead, apparently.)