Oh good question.
I wonder if anyone has examined the system load of PSVR2, compared to alternatives. The encoding used to transmit the video makes all the difference in the world -- when I was on an underpowered / baseline system playing Alyx years ago, the Oculus Link (direct connection) had a such a high drag on my system that the game was unplayable. But by switching to the super fast encoding of Virtual Desktop, it was a night and day difference.
So it's very possible that the PSVR2's adapter will bump up the system requirements of games dramatically if it isn't efficient.