serious answer: Just like you said, behind these projects are different visions and different goals so it would make no sense to sqash both together. Whats a sensible default to someone is horrible to another.
And open source has no such limit, take the linux kernel for example: a giant project of crazy scope which is free software and works better than commercial kernels. What free software lacks are in my opinion UI/UX designers, which is why many non commercially made free software have wierd user interfaces.