Then I thought; why did they even bother to continue to wear uniforms, especially since quite a chunk of the crew was originally Marquis, so people who had left Starfleet or had never been in Sarfleet to begin with
I think this goes back to the issue of....taking 70 years to get back home
The problem is.....it's made abundantly clear that it won't take anything like 70 years to get home (at best it will take a few years; at worst it might take ten) but the idea of them travelling together through space for 50, 60 years etc, just isn't taken seriously by anyone on board (which is probably because the writers also don't think for a second that it will take that long....most of the writers were probably thinking it would take about 7 or 8 years.....for obvious reasons)
Bit of a shame
Exactly, the characters had no way of knowing how long the journey would take. So as an audiance member you place yourself in the characters position you are facing a potentially seventy+ year journey what sort of think would you do/expect to happen?