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Why?
Weather doesn't happen in two big uniform blocks. More often than not, you have to change wheels because the ones you had on the last ride are wrong for this ride. That gets old fast, especially if you haven't got gears and brakes matched on the two wheelsets to a very high precision. Not many bikes feel great on two completely different tyres, and you really notice that when everything else is identical.
Many people have thought this thought, though far fewer have thought it was such a good thought after they've thought it through🙂