[EricH]

Originally Posted by swaxman12345

What was the philosophy behind caster wheels over something like omniwheels? Wouldn't omniwheels be better for rotational friction reduction?

Packaging, I'd say. Ball casters are very compact; omniwheels... finding anything smaller than 4" is very very difficult. And if space is critical, the less you use the better. I'd call space critical on this drivetrain.