Burnout is not good for people. But companies do not care. They can hire a fresh, energetic, hungry and passionate young guy, task him heavily. When he's burnt out, the company can replace him with another fresh guy.
Silicon Valley is based on the squeezing of these passionate young blood. SV workers have to realize that their work life is front loaded. They need to plan ahead for the life post burnout
"Finally, for many Valley programmers, the fast pace, long hours, stress runs the risk of burnout. One person describes it like this: "At first I thought burn out is like being extremely tired, like you've run a marathon, and you sleep for 3 days and recover and ready for another. No. it's not that like that. I'm tired, sure, but after I put in 60 hour work week for 4 months and traveled to China 3 times, mostly I just don't give a f--- anymore. I can't believe I’m feeling like this about my passion.""