Mama
Smash Ace
I think the simple solution is to compare them to any other fighting game and their "innovations". I dunno if it was said in this thread or not but most of the tactics and techniques used in games like Street Fighter can be considered exploits or even glitches. The idea of a combo is a glitch not thought of by the devs of street fighter. Using the stun time a landed hit gives to land more attacks was something players discovered.I'm not implying that they're bad, but the classification could affect the chances of it being kept in.
I think hanging on the edge so that another player dies is something the developers didn't have in mind when they decided to only allow one person on a ledge I think its something that started as a game physics rule and became a tactic.
Wave Dashing might be similar. Something Sakurai sees as an innovation rather than a cheap glitchy exploitation. If he's keeping the core players in mind I don't think he'll take away from things.