I said this elsewhere on the thread and so apologize for repeating, but: I know mid-career people working at this firm who have been through these conditions, and they were energized by the experience. They're shipping huge stuff that tens of millions of people will use almost immediately.

The cadence we're talking about isn't sustainable --- has never been sustained anywhere --- but if insane sprints like this (1) produce intrinsically rewarding outcomes and (2) punctuate otherwise-sane work conditions, they can work out fine for the people involved.

It's completely legit to say you'd never take a job where this could be an expectation.