The most gut-wrenching example, of course, is Captain Jellico, who arbitrarily changes everything, criticizes the way Troi dresses, won’t let Riker do his job – and regards it as a foregone conclusion that Picard is dead.

Jellico gets such a bad rap! His changes aren’t arbitrary, they’re intended to make the Enterprise ready for combat and he has only days to do it. Troi remained in uniform because it was a good idea. And Riker is just petulant and irresponsible; the scene where Jellico asks him to pilot the shuttle does NOT reflect well on Riker at all, and his constant challenges to Jellico’s authority are unbecoming an officer.

Jellico doesn’t regard Picard’s death as a foregone conclusion (the issue was his captivity, not his death.) Instead, he correctly prioritizes the mission over recovering one man–something Riker would not have done, and thus justifying Starfleet’s decision to put Jellico in command.

I still maintain that Jellico’s decision to disrupt everyone’s sleep cycles by changing to a four-shift rotation was unforgivable under the circumstances.
Reducing the length of shifts from 8 hours to 6 hours shouldn’t seriously affect most people’s, and if it did they have two more hours of off-duty time to compensate.
Still, it seems like a risky and high-handed move in context. Most likely he’s just doing it because it’s how things were on his own ship and to assert that his way goes. I’ve never heard anyone give an account of why it would be better to change the shifts.