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Wouldn’t that be more applicable in a universe that wasn’t flat (unlike ours as best as we can measure).

There is also no air inside and nobody's actually blowing. It's an analogy.

It is an analogy that is used to describe spacetime curvature though… its the wrong analogy.

No it's an analogy used to describe inflation with no boundary.

Air balloon has clear boundary.

The volume enclosed by the balloon's surface has a boundary, the surface itself does not.