An interesting observation and one that I have sought an explanation for.
My experience coincides with yours. I have never had a rooster have a hard moult. There are many more less than obvious physiological and biological differences between hens and rooster, from heartbeat rate to core body temperatures.
They do undoubtedly moult; my house floor is testimony to the fact.
What's more, their feather regrowth rate seems to be very roughly the same as a hens.
When there have been injuries here on both males and females and feather loss has occurred the regrowth time seems roughly similar.
Chickens lose and grow feathers throughout the year it seems from my observations here.
The nearest thing the roosters here get to a moulting behaviour that is apparent is when they roosters lose their sickle feathers. It seems from obseving here that these grow back once a year.
I've attributed a difference in dust bath preference between males and females to something to do with feather state and regrowth.
