I know this is an older thread, but I've always repotted orchids out of season, etc., and don't notice any immediate effects. I don't trim any roots (unless there is a lot of rot), I just pick off the bark and plop them into my preferred LECA media. I did that with my Sharry Baby a while back mid-bloom because the bark mix was drying out too quickly, and the flowers didn't die. Did it last shorter or longer than it would have? I wouldn't know. But at least in my case, it felt like the blooms lasted longer since I was able to take care of the plant better after repotting.
But would the plant stall if, for example, I pull it out of a S/H and repot it into S/H where the conditions are the same before and after? Would it stall if the LECA shifts during watering or something, and disturbs the roots? I honestly don't know but I feel like it shouldn't.
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