So the mechanics of this is well understood and nothing new at all, though it may be new for some. You can crouch out of a run, and you can use normals out of a crouch.



He never claimed this was new/revolutionary. It simply explained a concept that was not widely discussed in a clear, concise manner.



As for the 5 moves you have mentioned that are not well utilized:



Charged smash attacks are bad in neutral at all but the lowest levels. It only gives more time to react.



Nobody said that this technique could only be used in neutral. This can be used to tech chase or finish a combo. And this technique doesn't require you to charge them anyways.



The up tilts of the relevant characters don't cover the front very well. Run up and up tilt is generally a terrible approach for the top tiers. Wavedash up tilt is better because you can turn around first.



Again, it can be used to continue combos. Also Marth's Utilt is a good combo starter if he has a good read in neutral.



Ftilt is only really useful for Sheik. Outside of Sheik, most of the top tiers don't have that great of ftilts. You will see wavedash preferred here (it's my preference as well) because it requires precise spacing which is harder to achieve out of a run.



Yeah, thats mostly true. Though f-tilt might come in handy for Falco when the opponent is at high percents and by the edge.



As for jab, running jab is pretty good. Fox's is super good. Running jab -> Up Smash is an good approach with low commitment and high reward (except for against excessive crouch cancelers). You can see Leffen use it pretty often. It's actually Fox's furthest reaching threatening hitbox (as in, if you could hit someone with a running jab where you couldn't reach with a Nair). It's pretty common, but you may not see it because technically it's not safe on hit against a grounded opponent because of ASDID.



Yep, and other top tiers can get some followups off jabs, as well as simply being good for disrupting movement (not to mention jab resets.



I don't see anything here as under-utilized, especially on the pro level. The top level players know their options very well, and there's a reason if they're not using them.



I don't think that OP meant top players underutilize it, they obviously know about it (Not to mention they are unlikely to read this thread). This is probably meant to showcase applications of the technique to newer players.