They didn't even need to make different uniforms in "Among the Lotus Eaters", they could have photoshopped it. The character doesn't have to be wearing his uniform shirt later in the episode. Of course, TOS was guilty of exactly the same thing in "Friday's Child".
IIRC, all McCoy said was that he was stationed on the planet for a few months. Those 'few months' could have been any time between the events of 'WNMHGB' (where everyone wore The Cage uniforms) and McCoy's first appearance in 'The Man Trap.' Or as was mentioned before, it could have happened between seasons. I really don't see a continuity error here.
If it had been an option, I suspect they would've gladly gotten rid of the Discoprise design and replaced it with something more retro.
I don't quite agree. If they wanted the ship to look more like the TOS version, they would have done so at the start of SNW, without any explanation, just like they did with the Klingons. Instead they just reused Eaves's design and added huge front saucer windows to make the ship look even less like the TOS version.
Ironically, from the perspective of people who prize consistency in production design, memory-holing the look of the first two seasons of DSC is just compounding the problem. I, for one, would be happier if they went to the trouble of trying to integrate them and we the blue spangley uniforms and square-nacelled ships alongside SNW's new, TOS-inspired designs.
I for one am happy that they are essentially ignoring DSC. As for the ships, none of those DSC designs evoked TOS in any way. The closest tribute was the Engle, and that was only because it resembled the NX-01 from a completely different show that also looked nothing like TOS. I'd rather they showed the Kelvin from the Abrams films rather than any DSC ship.
As an artist, if I had designed the original Enterprise, I would feel Abrams and Goldsman had both massacred my design in every conceivable way. But if I had designed the original uniforms, I would feel the integrity of my design had been respected. It is this observation and subsequent belief that inspired my original post. Why the ships but not the uniforms?
Ryan Church designed the Abramsprise, and John Eaves designed the Discoprise.