While what you say makes sense to some degree... (I'm kinda playing devils advocate here)... but wouldnt having better, AA, high quality textures, more shaders etc, be even a bigger disparity than the parity that people are claiming Ubisoft is aiming for due the marketing deal with Microsoft.
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It would, but do you see people here talking or wondering about those other aspects here (or anywhere) ?
"Game is sub HD BOOO, lazy lousy devs !" nevermind the game does real time raytracing, radiosity, full anal rendering on two millions npc's (hypothetical scenario, of course).
People won't care. You could give them fucking Avatar in real time, but if it's not 1080p or 60fps then obviously "stupid devs couldn't be arsed to do some more optimization".
A lot of people will stop at those numbers, because they don't have an idea what goes on on the screen besides those.
Microsoft knows very well that most people will only read and make comparisons using numbers. 900p is always > 720p.
the rest, you usually have to dig deeper to find out and most people won't have the chance to compare the two versions directly anyway.
I'm sure you noticed how fast 'resolution' threads move on Neogaf's front page.
Heck, we could post these two threads "Half Life 3 announced, going to be best game ever" and "GTAV: PS4 1080p X1 900p" and see which gets more views.
The resolution drama has gotten beyond ridiculous, and Microsoft knows very well. They will keep asking for resolution parity (but i don't think they'd go as far as asking to boycott PS4 versions, and i doubt devs would agree to that anyway) regardless of what that means in terms of performance or features devs have to cut.
They need to advertise their games as running with the same "numbers" as PS4's.
In AC's case, i'm sure there's going to be disparity in many other areas, just not the kind of disparity that's immediately apparent on fact sheets.