I'm not sure if it's greater familiarity with the tools, or something else, but I can be on a 4 person group video call with my friends WHILE playing a VR game with them as well and everything runs smoothly and without lag for hours on end, but like 40% of video calls for past jobs have had dropouts, lag, difficulty hearing, and other issues.
One thing I think that really helps some of those issues is to get high quality headsets for everyone and make sure they know how to use it, but the lag I genuinely don't understand what makes it so common in work contexts.