I never had Steam asking for a hardware survey on my Macs - but it shows up on every windows machine I have.
I still think Apple will most likely focus on the mobile gaming market, since they are pretty dominant there. Mac will just get some games, that the publisher was paid by Apple to do so.
In the last two weeks, I've gotten the Steam survey invite on my Mac, my gaming PC, and even the copy of Steam I installed under Crossover to run Cyberpunk...