I’ll admit I did not know it was in Season 1, but I imagine there is more to it than the flip of a switch.
Same I thought it was pretty cool feature in S1.
They said in the past when they attempted to bring back head tracking in S2 it just completely broke everything. To bring it back they would have to overhaul quite a bit so I doubt they focused on it in S3. However I do think it was really cool so maybe one day it will return.