Nope, as cryptocurrencies are not really currencies, so you are always trading capital.

Taler experimented with a different direction when they built a distributed payment system for moving usual currencies digitally, even with a asymmetric behavior to preserve buyers privacy while making sellers taxable. Sad that it did not catch on.

This would most likely be based on stablecoins (US users would use USDC/USDT etc) so no tax issues there.

Technically, you are creating taxable events when going in and out of stables to normal USD. Its just that there usually only very minimal gain or loss in the transaction.

I don't think the IRS has taken that position and no tax professional in discussions around these issues has advocated for that. It might be something high frequency traders might keep track of but it's literally a rounding error for everyone else.