Chromee was delivered without any sprints at all. The team came in at 9 and left at 5 (figuratively, people actually kept their own ~8h schedules) every workday for a couple years like clockwork. No drama. No broken marriages, no broken families. https://twitter.com/hadip/status/1426587408267501568
Sadly, there were divorces and broken families and bad things that came out of that. But I also learned that even at a 20,000-person company, you can get a team of 100 people to work like their lives depend on it.