Cloud isn't a summoner, so they won't go crazy with the summons he has available in the game.
Uh, who cares? Why would this even matter? He's not a summoner so he can't use more than one summon?
Summons would only make an appearance in a super. By their nature, they're game changers. Yuna would be a shit character because her playstyle relies on them and you can't bring them into normal gameplay.
Lightning has Odin.
For Cloud's summon super, you can get far more creative.
Having Ifrit, Shiva and Bahamut come down for your level 2/3 super for some action is much more interesting than just Odin. Not to mention, Cloud can just call Odin too. More options means more potential. Simple.
Lightning does have a far better diversity of moves to choose from for being represented in the game, that's just fact.
No, it isn't. And you're not doing a good job of proving your point.
Sure older FF character have more spells, but they aren't going to include 'weakest fire/ice/wind/water spell' -> 'strongest fire/ice/wind/water spell' if the character isn't primarily a caster.
You have a character who uses a sword, can use dozens of spells, can use dozens of summons, has about 8 special moves, and you think they wouldn't use magic spells because he's not a caster?
If anything, I would expect two or three magic spells as part of the normal moveset. Fire, Ice and Lightning are solid picks. They're part of what represent FF too. They don't have to be massive AP builders etc. But magic spells should be part of the moveset. They don't have to get stronger either.
It would also give Cloud far more combo potential when mixing ranged limits, with magic spells and close range melee.
Lightning has all the elemental spells that you could need in putting her in a fighter, and paradgrim shifts would effect her moveset/gameplay instead of just being a casting option.
How would they affect her moveset? Give an example.
In a game like this, the Paradigm Shift would be worthless. It would cause balancing issues. You can't have a character who can switch between 3 different core styles when the game itself relies on giving characters one distinct style each. Toro changes styles, but the change of style is only to the moves he uses. Nothing else. That's how it'd have to be with a Paradigm Shift. And if that's the case, that's nothing unique.