I didn't make this clear in the original post I'm not just surveying HN queries to come to the conclusion that it's common. I'm currently in a management role at a highly mission-driven org, and helping people avoid burnout is a constant discussion because nearly everyone on the team has either been through it or at risk of it.
(The high burnout rates aren't because of external pressure, it's because the team is mostly here because they deeply care about the mission.)
(The high burnout rates aren't because of external pressure, it's because the team is mostly here because they deeply care about the mission.)