But the arguement can still be made that they are only good at Smash under a very specific rule set.
Personally I have more respect for the guy who wins a Smash tourny with items turned on and all stages playable than the guy who only can win under a very specific set of rules that totally remove certain aspects from the game.
Items are literally a randomized equalizer. You could certainly have tournaments like that (they did in the early melee days!) but it wouldn't be a test of skill for whoever won it