Interestingly, Id was led by John Carmack, who was also a big fan of VR. And Microsoft killed the AR/VR/MR teams a year ago.
So, I'm guessing internally there were some leadership hopes that IdTech would help support IVAS and related professional AR systems and when those failed to be adopted at scale, IdTech lost a key sponsor. I'm guessing it's been a rough year of internal advocacy since.
Carmack hasn’t worked at id for 13 years
Carmack had left id by the time he got into vr/at, iirc they snagged him from a rocket company?
Carmack left id waaay before Microsoft has acquired id (transitively by acquiring Zenimax/Bethesda)