Is it possible to wear out the threads? Probably. Will you do it by testing a few barrels? Probably not... someone with more experience may weigh in here, but as long as you're careful and using proper tools & grease when you do the barrel swaps, I would think it would be OK. My big concerns would be minimizing strain on the upper and avoiding cross-threading a barrel nut.
Take this with a grain of salt though, I'm not an armorer.
"We must, indeed, all hang together, or assuredly we shall all hang separately." -Benjamin Franklin
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