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As long as you can always swap your battery again I don't see the problem

As long as the average battery health in the system is like 90% and the minimum is say 80% why would you care if you're getting a new battery every few days?

If anything it removes a big cause of depreciation from your car

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That is fine if you always are swapping. However if you normally charge at home that becomes a big deal - if your current battery wears out/fails because it has 500,000k miles on it are you out a new one? Do you pay for the tow to get to a swap station? Again, if everyone always swapped this would be easy to amortize and not a problem but the mixed use.

Of course this isn't a new problem. I know people who own their own welding gas tank - but they always swap the tank out. The place they swap at somehow handles when the tank needs to be re-certified - and people don't ask questions.

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