Judo - using your opponent's force against him
Ali-Frazier: "Rope a Dope"
Ping Pong [the "chop master"]
Stratego [anyone remember that game?]: he who attacks usually loses because the attacker reveals more high-value pieces than the defender. OK, so maybe Stratego is not a sport.
"Fun" and "effectiveness" are two separate things. I can see how someone might not view playing a pusher is fun. I can't see how someone would lack the imagination to figure out how that [pushing] might be a winning mentality.
Then again, we've had this same argument in different threads. You say "I can't imagine why someone would do X [where X is "playing while injured", or "playing singles even though she's a better doubles player", etc]." I propose several plausible [to me] reasons why someone might. And then you reject them all, saying no reasonable person would do that.
I've already acknowledged that pushers value winning more than playing real tennis.