Sometimes folks who don't race just don't know. I cruise Slowtwitch a lot for good info.
Folks over there are convinced that real world racing is full of 100kg bike racers blasting out 350w for over 20min and able to win a bunch of stuff. Just like Zwift.
Zwift B racing is full of 100kg dudes blasting watts. Probably on some fluid trainer with a horribly wrong curve. I went in Zwift power and counted one B race with about 1/3 of riders nearly 100kg's.
They're convinced this is how it would go down in the real world also. Nope.
Zwift is a game that helps with training. Not reality.