If a PS4 user does not advocate for games to come to the system, then who will do it instead? Answer: Sony, obviously. They're a giant corporation working very hard to bring games to the system. They have millions of dollars to spend, and will do a better job than any consumer -- even a group of consumers -- ever could.
If a PC user does not advocate for games to come to the system, then who will instead? Answer: no one. There is no one with specific, proprietary interest in seeing the platform succeed for gaming.
We generally don't like port begging, but in the case of PC, consumers are the only advocates for the platform. That is not the situation for any proprietary platform being pushed by a large corporation with a vested interest in seeing it get as many games as possible.
Again, it doesn't make PC port begging appropriate in all cases (we've banned for it in the past, and surely will in the future), but it's contextually different.