It is not a problem if you are an assembly line robot making motions. People, however, are not robots. They get held accountable by their higher-ups for delivering on these (often nonsensical) priorities, they risk getting fired when expectations are not met, and high uncertainty of faulty planning systems like that is extremely stressful in itself.
Expectations will be raised until they can't be met anymore. There is always a ceiling.
It is on every single worker to make sure that they don't please the system beyond what is reasonable. Often the problem is people who overwork themselves to please and set the bar over the reasonable amount of work. Still when the majority does not raise their output to an unhealthy amount that must be accepted as a ceiling.