Yes, its an assumption, and generalized assumption at that.
Yes, I know that the PS4 is a more powerful system, and that the XboX One has bottleneck issues entirely of its own making that causes games, in particular, 3rd party games to not run as well. Yes, I am very well aware of these things. My comment only meant that developers will eventually find a way to get it running 'close enough', and no not Albert Penello's version of 'close enough'.
But yes, 3rd party devs will eventually figure it out, there's too much money left off the table to not figure it out.