If you read carefully I actually suggest not switching their group comp as it's not worth overall and the shado-pan monastery is the only case where it might be worth it, but that dont warrant changing someone since overall it's not needed. I'm pretty sure we pretty much agree I just worded myself poorly. Overall, I'd bring the player and the class they WANT to play with.
Yeah, I'm probably coming across as bit nitpicky as well for which I apologize. I agree with your main points and think it's the least hassle just going with a consistent group if the goal is to simply complete the gold meta.