5Ghz is stuttery and laggy and makes it pretty much impossible to have a clean video call. I don't game, but gaming on it would be miserable. I've measured latency, and it regularly spikes above 1s.
6E is far, far better. Rock solid video calls. Latency testing sites show low, steady latency. The only real problem is signal attenuation seems to be far worse with 6E. Getting a signal 2 walls away from the router is nearly impossible. Though this is also a strength, as it limits the number of devices competing for spectrum.