I think that emotional connection through a good story is more important than looking similar, but in a modern film, there is no reason not to have both. The problem is when a mediocre flick is presented to said children as some sort of empowerment, they will get the wrong ideas. This is what I fear here as well, identity politics for the sake of identity politics.
You say that marketing weasels will be marketing weasels, but that has a bad social impact which should be considered. Obviously, such consideration will not come from "critics" which have proven to be incapable of critical thought for the most part, so it should come from the public.
Rather than calling anyone who doesn't like their silly precious film as "straight white men sexist" or "straight white men racist", some thought should be put whether a plot is worthy of such high regard, and if not, what is the motive behind pushing such an agenda.