It's weird how Paul or Mary Jo heard this from a couple of unverified sources, then they repeated it a couple of times on their show, and now suddenly it's accepted truth
Look, you don't have to believe me of course, but I worked on the entire Windows 8, 8.1, and 10 product releases from beginning to end. I saw all the schedules, the revisions to schedules, and pretty much everything else that happened internally.
There was never an
instant where Windows 10 was scheduled for this Fall and then moved up. The sheer idea of that is hilarious to me because everything about it is so ridiculously infeasible I don't know where to start!
The release date for Windows 10 was one of the most solid, unmoving release dates I've ever seen in my long history of working for Microsoft. It was set for July of 2015 for more than a year - and before that the release date wasn't October, it simply didn't have a release date yet. At most it moved by two weeks at one point, and that's it.
So this story that Paul and Mary Jo keep repeating that it was October and then moved up to July? Doesn't exist, never existed. And not because "moving hardware is harder than moving software", it just never happened at all.
(And when you have a worldwide release date with marketing plans, partner plans, and a billion other moving parts? It's not necessarily easier to move that software release date anyway, if that was the case in the first place)