I was recently part of a program for ~2 years that was essentially in perpetual sprint mode. We never had time to stop and consider the impact of decisions, because requirements were constantly shifting beneath our feet. All the tasks and sub tasks, and their interrelated nature was haunting my dreams. I would have sudden panicked realizations in that brief window of clarity before bed that I forgot or missed something.
There was always an acknowledgement among all in the (virtual) room during calls that the problem was outside the room, or that "yeah this sucks, but it's the least bad way to run the program" or something like that. The technical problems were interesting to me, but not enough to sustain my motivation through that.
"Sprints, on the other hand, are fake deadlines". Amen. As a result of what I described above, it was hard to take these "deadlines" seriously.