And this possibly wasn't the beginning of tensions at ID/Zenimax about Carmack splitting his time with outside or non-core activities. Before VR there was Armad

And this possibly wasn't the beginning of tensions at ID/Zenimax about Carmack splitting his time with outside or non-core activities. Before VR there was Armadillo Aerospace and his pre-iPhone interest in mobile games. Carmack claimed that he tried to maintain some level of involvement with ID after quitting as a full-time(ish) employee, but that this was refused. Beyond even that, the spat may have been partly a continuation of ID office-political strife that stretched back to the Quake (1) era. Then there's a whole other tangled story involving Michael Abrash and his comitatus at Valve, Palmer and the original Oculus guys, Mark Zuckerberg and Facebook, other teams at Valve that also got excited about VR or AR at different stages, and Valve's office politics and internal decision-making. EDIT: watered down some adverbs.