I haven't seen any such email. It definitely can be a lot of work at times, esp around re:invent, and I'm sure there are those with bad experience.
I'm just saying, it's worth giving a shot. You might like it. If you don't, switch orgs/teams. You can switch just a couple months after joining if it doesn't work out for you. I switched from my last org quite quickly cause while I had good work life balance, the work was just so boring.