Unclear what this actually means. Can I pay my credit card bill using crypto? That's a taxable event and a pain in the butt to track. Can I buy stuff from merchants using crypto, and they receive crypto? Useful, but most merchants will want fiat currency, so someone on the chain will have to convert it to dollars, which again would be a taxable event.
I don't get it - you're trying to avoid paying tax into the society that you're using, benefitting from? Edit to add: Many replies are acting as if it's difficult to automatically, digitally track conversions and taxes, to then pay your taxes? It's a digital "currency" we're talking about here.
There are many legitimate and ethical reasons why someone would want to avoid taxes they're not obligated to pay.
To your second point about calculating and tracking these expenses, it gets messy really quickly. Certainly do-able, but messy nonetheless. Imagine having a 1099 that is dozens of pages long because it's basically your yearly credit card statement. Imagine having to pay a capital gains tax of like 5 cents on a starbucks purchase. Interestingly enough, this isn't a requirement when paying for things using foreign exchange. You don't have to track gains if you take a vacation to Europe and pay for things using Euros. So I think the goal is to have crypto transaction treated like a Forex purchase.