Well they are not taking anything away, just not offering something more like what MS is. I think that's a fundamental difference. People who don't care about this don't care because its not something they've ever bothered with, and would never have known about had MS not decided to go in on it for their own reasons.
Its like 4KBR. MS gives people one in the XB1S, but unless you were specifically looking for a 4KBR player, its not really a killer feature.
If it was something like DRM where MS were intent on changing up the rules of ownership, that gets people off their asses.
We've heard from at least a few developers who have PS4/XB1 crossplay functionality tested and ready to go, with Sony's approval being the only thing standing in the way of it being implemented. That makes for a pretty thin line between "not adding" and "obstructing."