Ok, let me put it this way:
Right now people are discussing left and right how to really balance this game the right way. Like Pig said: nerfing top characters until everyone sucks isn't a good solution. And like 16-Bit said: making all characters have the Killer Frost/Batgirl vortex or making all characters be as dumb and safe as Superman/Black Adam isn't a good solution either.
Would giving all characters a powerful vortex and 50% combos balance the game? Yes, probably. But would it make the game better and more fun to play/hype to watch? Not really. It would just make every matchup annoying to play and all characters stupid. That's not what we should aim for either.
As m2dave and others have already pointed out before: In this game, you either need 50% combos, a standing vortex, superior footsies/mobility, a great trait and/or a great Super to be top tier/viable. Being only good at zoning or footsies or rushdown doesn't cut it.
But what I'm saying is that the reason WHY characters need 50% combos or a vortex to be top in this game is mainly because of the no round system and lack of comeback mechanics. That, to me, is the underlying problem.
Top characters imo:
-Superman (mobility, best footsies, great zoning, great damage, good mixups, OTGs, great trait, great Super)
-Black Adam (mobility, footsies, good zoning, great damage, great trait)
-Aquaman (footsies, zoning, best trait)
-Wonder Woman (footsies, damage, corner OTG/vortex, good trait)
-The Flash (mobility, damage, vortex, good trait)
-Batman (great zoning, great trait)
-Batgirl (damage, standing vortex)
-Killer Frost (safe slide, standing vortex, good trait)
-Doomsday (mobility, relentless pressure, great trait)
-Green Lantern (footsies, good zoning, good trait)
-Green Arrow (mobility, great trait, great Super)
-Sinestro (footsies, zoning, great trait)
Then you have characters who are really good at zoning but don't have a good trait or a good Super (Cyborg/Deathstroke/Harley). Characters that have a good trait but don't have good damage or good mixups (Raven/Hawkgirl). Characters that have good mixups but not really good traits, damage or good zoning (Joker/Shazam). And characters that lack the mobility or footsies to compete with the likes of Superman and Black Adam (Bane/Lex).
I don't want all characters to have vortexes and 50-60% combos. But I do want all characters to at least have: Good traits, good mobility, good footsies and good Supers. And if a character has 50% combos or a vortex, then he should suffer somewhere else.
Killer Frost to me is balanced, because even though she has a powerful vortex, at least she is lacking in mobility and damage. But characters like Superman are just amazing at everything and have no drawbacks. Of course: he's superman! He should be perfect and far above everyone else! I'm sorry but that's not how fighting games should be balanced.
Balance character (Ryu) = jack of all trades, master of none
Specialist character (Makoto/Ibuki/Dhalsim) = master at 1 or 2 things, bad at most other things
Master character (Akuma/Seth) = master of all things but very low stamina/health