Perhaps I'm naive, but when I see companies that work like this I assume they either don't know any better or are just scared stupid. Or perhaps it is a macho startup thing.
I don't think it's either of those--I think it's a natural progression of a startup whose composition is pretty much entirely of young people straight out of school who don't have as many obligations outside of work, as say, someone with a spouse and kids (I have a spouse, but no kids). We're all trying to get on better schedules, and my post was was in no way a criticism of how things are run at Pulse.