Sadly, I think part of the reason is that McCarthy doesn't fit into the conventionally attractive model that just about every other A-List actress falls into. Granted, her being on that Mike and Molly show after she hit it big probably complicated her schedule, and she's probably not interested in doing that many movies. But considering Bridesmaids was more popular than Girls Trip, and McCarthy had way more buzz for her performance than Haddish, the fact that McCarthy's only done movies with people she's already good friends with (Feig, Heller) or her husband, while PTA stated he wanted to work with Haddish just months after Girls Trip came out kinda says a lot.