How hard is it for people to put a dust cover on their console? Really? It is a total none issue for anyone with a basic understanding of dust and an electric device.
But the vast majority don't. They find a place around the TV and that is where it stays, sucking in whatever. It is alright saying what people should do, but I think Sony are addressing the way most people use their consoles, to help clean the console months/years down the line. For this generation of consoles especially, cooling seems an important thing, linked to the noise they make, and dust has an adverse affect on that. I can't see a negative of a manufacturer giving users the option to more easily clean the dust from a console.
My PS4 is sitting on the table in front of me slowly gathering dust on top. It is nowhere near the carpet though, so thankfully not sucking dust from that, but there is obviously dust in the air. And being so high up, and on a solid surface, the carpet is not limiting airflow, which it does for some people, and also sucks more dust in in that position.
My PC is on its side, on a stand about six inches off the ground, but the intake and exhaust fans on that had a surprising amount of dust on when I opened it up after a few years last month. There is dust in the air, and whether you use a cover or not, in use it will pass through the airflow system.
Time will tell how both of these consoles handle the airflow through the case, and whether sut will be a problem or not.
Hopefully not.