I think what we have here is a place for grandma and the little ones to hang out INSIDE while the rest of their party rides the Guardians of the Galaxy coaster. It's not meant to be a headliner attraction, but it is useful for a certain demographic.
It's the same reason there happens to be a playground at the Mission Space exit, or racecars at the Test Track exit. These not only offer additional things to do after your ride, but they offer an alternative experience for those prone to motion sickness or too young to ride.