OFDMA and adjustable guard interval modulation are already features of WiFi since WiFi 6. So its not like they're just ignoring those things, they're already there.
Yes, but my original point was the IEEE came up with these things (OFDMA, MU-MIMO, fronthaul MIMO, GI modulation) when they were given the opportunity to focus on optimization instead of speed. I am saying it would be nice if they would continue to do this instead of QAM++.