Criticize my thought if you guys want. Just speculating (heh)...
What if MS helped to make AC Unity be 900p on the Xbox One? What if the game was originally set to be less than 900p on the Xbox One?
This wouldn't negate the fact that Ubisoft still held back the PS4 version but even if they did, I doubt the reaction would be the same because you would have had a 900p vs. (less than 900p) situation; PS4 version would still be better and people would accept that since it's the more powerful system.
This is all just me speculating though. Overall, what I'm trying to say is MS could have added on to this current reaction without them intending to (if again, it's true that they helped AC Unity be 900p on the Xbox One -- but again, it's just me thinking about multiple situations that have led up to this).
The issue is them saying they locked the performance the same to avoid debate. If MS helped them get it to 900p that's great. But what does that have to do with Ubi specifically saying they locked it to avoid debate?