While PlayStation is on a streak of one bad decision after the other, I'd give them benefit of the doubt here.
Kojima likes to work unhinged on grand ideas with a tall budget which may stick or not stick at all. So may be Sony didn't like the direction of Physint and decided to dump it.
While Sony may be wrong in judging the game in its early stage, the replacement publisher, Microsoft, has solid track record of terrible taste at creating exclusives.
Which of his ideas didn't stick? Pretty sure the guy hasn't had a failure in recent memory.
He was also facing cancellation at Sony, so it's plausible (if not likely) that he had to accept less favorable terms from Microsoft.
Hopefully we won't get another MGS:V situation where the last part of the game is just kind of missing.
This situation seems very similar to Konami's frustrations with him a decade ago. Don't get me wrong, Konami too seemed hell-bent on driving into the ground, but Kojima does have a reputation for going over time and over budget. In a world of tightening belts, I wonder if Sony execs felt the same frustration as their counterparts did. We'll see how he fairs with Xbox, which seems even more eager than the other two to shutter things these days.