For Xbox One, I'll state this. We never discussed UHD Blu-ray when we built the first Xbox One. Internal component designs are spec'd years before the box hits shelves. UHD specs didn't exist, there were no discs to test against, and there was only a vague notion it was coming in the future. So there was no planned obsolescence, no secret components in there that we hid "just in case", nothing of the sort. It wasn't even on our radar. The drive is different, HDMI version is different, and the security is different.
HDCP 2.2 didn't even ship until after we launched - HDCP 2.2 TV's didn't really show up until 2014, and at that point TV manufacturers were also saying that the older sets were not firmware upgradeable. So it seems strange to assume we had the HW in place years before that, and all the testing done, just ready to go, and decided not to unlock it.
You can choose to believe that statement or not. I understand that people are dubious of my claims, fair enough, but I'm not sure how much more clear I could be.