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I don't think that's the issue. Starlink won't even let you move from one cell to another even when the cells are served by the same ground station. And moving from one ground station to another is no harder than handing off from one cell tower to another, which I assume was solved 30 years ago. They just aren't allowing it.

When will that be?

Also how do they update hardware on a satellite? Or are there other problems keeping them from establishing intersat links for now?

They don't update hardware; they have to launch new satellites that have laser links.

You do not need intersat links for mobility.