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All joking aside, like Ubisoft, you're missing the point entirely (although unlike Ubisoft, I don't think you're doing it on purpose). The problem isn't that it's 900p vs. 1080p, even though that's a function of the debate. If they made a game and genuinely could do no better, that's fine. It is what it is.
The problem is they admitted out loud that the reason they're doing it is for the bumfucking retarded reasoning of "[they] wanted to avoid debate", which is just fucking over the majority of potential consumers for Assassin's Creed: Unity - PS4's userbase dwarfs XBO - to either appease whining fanboys or their business partner Microsoft. 180p is actually substantively a huge difference, 600,000+ pixel difference and is extremely noticeable to anyone with an even remotely discerning eye. So while you're right the mass market might not know better, that doesn't actually change the fact that it's bad for everyone involved.
In no way is this a positive for any consumer: Microsoft fanboys were going to get the game at 900p/30fps no matter what, and in the future if they got a PS4 they could try a better version of the game.
And PS4 fans are now stuck with an inferior version of the product because petulant fanboys cannot shut their goddamn mouth about their own stupid console buying choices. If those fanboys did the research, they'd know PS4 is significantly more powerful and that would be the result 99% of the time (as it has been so far). But instead, Ubisoft irresponsibly decides that they're now business partners with Microsoft, so it's in their best interest to actually appease these sick "gamers" and with the double benefit of pleasing their $$ backer as well.