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I suppose there's a possibility that frequently attaching/removing the focuser might wear out the threads, or the fact that you expose the hole at the end of the ota while doing this.
For me the biggest issue would just be the hassle of doing it every time. I hate refractor cases that hold the ota but the diagonal has to be removed for transport, and diagonals just need to be slipped in, not screwed. I'm always trying to minimise the setup/teardown time, but maybe that's just my laziness.
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