I think some one was misquoted or spoke an incomplete sentence. The rearm pad is one of the many cool features of the game. If I'm not damaged in anyway and the fight looks good I may rearm. That is assuming the possibility of getting vulched is at a minimum.
However, I often land with a gun out, gear missing, oil leak etc. At those times I don't rearm. Also a guy told me a long time ago if you get hit and show no damage you should get a new plane because the likelihood of damage from any more hits will probably cause a major malfunction.