Keep on making dismissive assumptions.
I have nothing against the idea of a female character all about motherhood in concept. None at all. My own mother is very much a woman who feels motherhood is the absolute most important thing (for her) and I absolutely respect that, as I would for any other woman feeling the same way. So this "nah, it's prejudice to make this argument" remark is nonsense. In isolation as well as in proper context with proper implementation, it's absolutely fine. Like has been said, there are real people who feel that way, and it's absolutely respectable to find children to be one's life calling.
But in a movie where the implementation is a character who solely exists to teach the main female character that her life (as an extremely successful business woman running one of the biggest theme/animal parks in the world) cannot possibly have any value until she realizes she needs children, where the main character in question represents every single regressive depiction of "strong independent women", and the only other female character of note is passed off as a bitch for valuing her job and not wanting to babysit shitty children she doesn't know - who is then killed in an elaborate death scene meant to punish her and reward the audience, THEN we have a context and implementation where it's bad.
Edit: It's also worth noting that Trevorrow said the real reason women aren't directing big budget films is because they just don't want to.