I mean while that would have been cool Inhumans got cancelled after season 1 aired so I don't think the approach of having them crossover wouldn't have been liked by fans. I think Inhumans needed to be fixed

Having just Agents of Shield and Agent Carter crossover was good enough

I mean just cause a show was cancelled doesn’t mean there can’t be crossovers like inhumans ended with the royal family bring the inhumans to earth correct so that could of tired in shield especially with daisy

I mean sure it would be cool but seeing how Agents of Shield was their own thing seemed like there wasn’t plans for crossing over with others besides Agent Carter

Like RedHead said , story wise they could have connected Quake in her efforts to relocate the inhumans to the hidden island where the Royal Inhumans were. That would have been tidy. However after season 2 & 3 , writers of Agents of Shield moved on from that whole Inhumans thing.

When Yo-Yo asked Coulson about rumors of people living on the moon , Coulson just waved it off like it was false. That did not help at all lol but it was still a reference.