It's big enough to do better everything the xbox does. That's why one platform consistently runs things at 900p and the other all the way up to Full HD. When parity is achieved, you can be 99% sure that xbox as squeezed to death while PS4 still got plenty of juice unused.
Again, these are just assumptions -- assumptions more than likely based on games made by different companies, that released during different periods/years.
Also, "parity" doesn't automatically mean using a ton of the Xbox One's power. Heck, there were a few 1080p games on last gen consoles. Therefore, "parity" could mean having 1080p games on both the PS4 and Xbox One with there being a ton of unused power on both. In this case the game would more than likely look unimpressive (even though it's 1080p).
A situation like that would make FAR more sense to get angry/mad about in comparison to this (The Division) -- a game that looks solid on both consoles.
This was very noticeable during PS2 -Xbox era, And I remember the Microsoft crowd being vocal about it. It's just the opposite right now.
Not really. Original Xbox got held back in ways outside of just visuals for a few multiplats. Smaller dev teams worked on Xbox (and GameCube) versions of some third party games while bigger teams focused on PS2 (most likely due to difference in console user base size). This caused some multiplats that not only
looked worse on Xbox in comparison to PS2, but also
played worse, and have
missing game modes . That was definitely an acceptable reason to complain for people who owned the more powerful console.
That situation isn't similar to what we are seeing here with The Division though (a game that looks solid on both). On top of this, the power gap between the PS2 and original Xbox was larger than Xbox One vs. PS4.