I maybe wrong here, but wouldn't that really only be the case if the games used 2xMSAA ? how many games actually used that last gen ? Wasn't the edram the reason for MS trying to get 4?x MSAA as standard across xbox games and that didn't work out. Most likely because you would need to split and tile, right ? which makes it a more complicated procedure and most likely why most games had no AA or some other form like FXAA.
or is that totally wrong ?
That's the general idea, but lord Astro was insistent that the development environments are exactly the same (they really aren't) and by extension developers would be able to do more with XB1 sooner and quicker than PS4/PC/Wii U.