There is lots of potential in Wonder Woman's cast, but lots of writers have chosen to go with the most boring decisions long-term.
Because there are examples where Diana's friends are done right. The movie for one, The Legend of Wonder Woman for another. Heck, even Morrison managed a delightful Etta Candy in Earth One.
And Ferdinand (which I was ho-hum about earlier) certainly has some real potential, as Wilson showed in the summer oneshot adventure, though it requires the right kind of writer. Add in either Julia Kapatelis or Helena Sandsmark, and you have a solid beginning core for a cast.