Except under extreme circumstances. I witnessed a Phil hub that failed catastrophically when the freewheel was driven on so hard that it took the right flange with it, driving it towards the center of the hub, which made the wheel collapse.

That was in 1977 at the Fargo Street Hillclimb, an annual LAW event where if you ride three blocks you get an embroidered patch. It averages 33% grade and it's steeper at the top, maybe 35%. Lots of people try and fail on that hill, but there are spectators to catch you so you don't slide all the way back down!

The wheel that collapsed was on a Santana triplet with three big racers aboard (serious Cat.1 dudes IIRC). I helped build that frame, and I was on hand as a spectator to watch the attempt, and of course to ride it on my single. Still have the patch.

No one had ever succeeded at riding that hill on a tandem before, dunno if it's ever been done to this date (I moved away, didn't follow it). So we didn't expect the triplet to make it, but still it was shocking how quickly it failed. The wheel collapsed almost immediately upon hitting the bottom of the hill, maybe like two pedal strokes into it. Rather anticlimactic!