Ms. Marvel doesn't mesh with Marvel Animation's priorities right now. They are pushing for the boy demographic really hard and that means as much action and silliness as possible at the expense of romance and characterization (even though boys enjoy that too). Ms. Marvel also doesn't have a lot of source material to work with. Maybe in couple more years, but right now there just isn't enough to work with and it's being upended by Battleworld.
Captain America has needed a cartoon for forever. I do agree with him and Dr. Strange needing one.