I think the flaw is believing that tax law is as immutable as the Bitcoin blockchain.

Plenty of examples in other countries that decided to raid retirement savings when they got into trouble.

If you believe Bitcoin will succeed that includes scenarios where the US dollar fails. In a scenario where the US dollar fails, they will try to steal as much as possible before that failurw. This might include taxing any retirement acc worth more than $X.

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Roth accounts allow the government to collect more tax revenue now. Game theory supports they will continue to want more money now at the expense of the future because they have terrible time preference. No guarantees but the case for Roths sticking around is solid.

This logic is a better argument against 401k and traditional IRAs than Roths as those former 2 reduce taxes now.