That makes no sense at all. If she didn't want to share any screentime, then she would want a solo film. But, as I said, she DIDN'T want a solo movie. So your argument crumbles into dust.
Halle only ever wanted the character to be more meaningful and more like the comics, because fans (yes, people on here) kept asking for that. Angela Bassett turned down the Storm role because she said it was too weak and not meaningful enough. People on here wanted a better depiction of Storm, as well as other characters, so Halle was only reacting to those things.
If the balance wasn't right, then blame the writers who wrote the dialogue and the scenes.
Halle only wanted her character to have more depth and meaning, and she was right to want that.
Taking out your bitterness on the actress is very petty and stupid.