If you've scared them into not using fireballs, that's already a win for you. And it's not useless against arcing fireballs, since if you see them do it or anticipate it can still rush through the entire screen and punish them. I've done it against FANG and Dhalsim, you just have to be ready for it and anticipate the fireball.
I already explained this, you don't seem to be listening. They require you to be at least somewhat aware of what your opponent is doing and to anticipate an opening or opportunity to use it. You want it to be a tool that's just an easy way to get in, but that's not what it's for. And yes, I already talked about the EX guidance in my last post, it's clearly not meant for much outside of raw damage in a combo, you just seem to want it to be something different.
Also, I remember reading that he has the shortest charge time in the game, but I could be wrong about that. Anyway, yes, bottom line is that it's a good move that needs to be used intelligently and not thrown out at full screen for no reason. There's nothing wrong with that.
Again, none of this sounds like an inherent weakness in Necalli's moveset, you were just using them at the wrong times or against characters that had answers for them.
Nah, standing HP is better for meaties since it's active longer and I think it also comes out quicker. cr. HP is obviously better as an anti air. And as I said yesterday, you can get a follow up after a juggle if you're close enough. Even if you don't, it's worth it for the hard knockdown and extra damage that a CC gives.
His dash is fast, you can use that to your advantage to throw your opponent off. Footsies isn't just about having a move that gets you in close for free.