It's not just a Hollywood problem It's a Godzilla problem in general specifically when more then one monster is involved, I can honestly say I can't think of one Godzilla vs film where the human stuff is just as interesting as the monster stuff, even the director of minus one recent said he would have a difficult time making a human story good if there's more then one monster as the human characters would have significantly less personal connection with Godzilla. It probably why GvK and GxK mostly follows Kong since he's allowed To have a personal connection to at least one or 2 human characters