I agree that when done right (ie, following a proper SMD reflow temperature "curve"), all that should happen is the solder should flow and not much else. Even

I agree that when done right (ie, following a proper SMD reflow temperature "curve"), all that should happen is the solder should flow and not much else. Even so, just as I wouldn't reuse a pan or pot I had created sugar candy rocket fuel in to cook dinner (no matter how clean I tried to make it afterward), I also wouldn't reuse an oven for cooking purposes, that had been used for reflowing a PCB previously. It just seems like a "best practice" to me to not reuse equipment in that manner for food cooking and consumption. That's just me; I don't find the potential harm, no matter how objectively slight it might be, to be worth it in the long run.