Funniest thing is how out of date these arguments are.See, people always say that but don't elaborate. Why don't they lend well to competitive play? Because they insert a tad of randomness to the proceedings? So what.
People don't like to lose, so they make up rules to ensure they minimise that possibility.
Many often reference the random exploding capsule as the biggest reason items are banned, when Smash 4 allows you to turn them off (believe Brawl did too). Nothing changed. Wonder why?
It also seems fairly obvious that Sakurai would probably be more accepting of Smash's "competitive" scene if tournament rules even slightly resembled what Smash Bros actually is. I certainly wouldn't be proud of a comm. that removed half of the content I developed in tourneys because of ego rather than logic.