I assume Marvel people have storylines they want to say about masses of people who are persecuted for reasons that aren't their fault. While mutants have tended to be equated to non-heteronormative, just regular citizens with a quality society doesn't approve of, prejudice against Inhumans is against literal aliens hidden in the populace. I'd rather both species co-existed personally. It also solves the problem of "how did this person gain powers" that was the entire point Stan Lee introduced mutants way back when. Not everybody should have an entire origin movie to explain why this person has powers and runs around in a costume..

I thought making Guardians was a mistake, but somebody had a story...\o/