No doubt we talk about it that way.

Not every company is like that. LinkedIn was famously 40-hour weeks in the early days. I just started at a company that's pretty aggressively work-life balanced. We're no doubt a startup (VC funding, high growth, the whole 9 yards), but we just don't believe that 80 hour weeks translates to the best work. You are first and foremost your own caretaker, and it's probably bad if you're in the office 8-6 and working at home.

Culture matters, and it's different at every company. Don't let what's said on Twitter fool you into thinking it's the same everywhere.