Maybe because they learnt to deal with it and not many gamers have both consoles.
This has been talked a lot at the launch, so most people dont see the point of bringing that issue every month i guess. There are a lot of things like that, for example, nobody talks about the big PS4 controller advantage when it comes to plug in any headphone you want for free, nobody talks about that whereas it makes a big difference in games like alien isolation or evil within.
Well, try this Google query " alien isolation xbox one slow installation time"
It didn´t give me any information.
Not even the DF analysis