Of the 50 characters available for play, 10 are female. And of those 10, 6 are speed characters. (SC, Mocking, BC, Gamora, BW, and Elektra)

We only have one Blaster female (Wasp) and one Combat female (Nebula), while we have 2 female universals (CM and Angela)...

My point: I like playing female characters. Always have. But I don't have much of a roster to choose from if I want to play at a decent level on Arena with a female roster. The most arguable best all-female Team Bonus is Shield Divas... but those consist of 3 Speed Characters. Likewise, notable mentions include BWB or Femme Fatale... also 3 Speed.

I really hope these alleged leaks of new characters are true, as She-Hulk and Singularity (though, it's more of an ambiguous gender that takes on female looks...) would open the floor to new team comps that aren't all Speed...

tl;dr-- Most all-female comps tend to be Speed heroes. Need more diversity.