https://www.ccn.com/u-s-bill-would-ease-bitcoin-tax-regulati...
Things get weird when you use a strange currency for any transaction.
[1]: https://www.irs.gov/individuals/international-taxpayers/fore...
Say you purchased X amount of CAD a few years back for $0.70 USD. It doesn't matter how much you purchased.
Now some time goes by, and the current market rate for CAD is $1.00 USD. You go ahead and purchase your $5 CAD coffee. By doing that, you've realized $5 CAD of your investment, which is currently worth $5 USD, but when you bought it it was only worth $3.50 USD. So you made a capital gain of $1.50, and you have to report and pay tax on that.
Whether you purchased a coffee or converted to USD doesn't matter -- the important part is that you made a gain on the CAD over time, then used it for something.
Europe is an instructive example here. Most of a continent was sick enough of the hassle that they eliminated 19 currencies in favor of the Euro [1]
Another good example is Ecuador. In the 1980s, both currencies were in use, with dollars being used by wealthier people for larger transactions, including savings. That was due to financial instability that got worse; eventually Ecuador just gave up and adopted the dollar. [2]
So to answer your question, it probably doesn't make sense, which is why approximately nobody uses Bitcoin as digital money. In contrast, look at the digital money scheme M-Pesa, which started around the same time. It has many millions of users and has seen widespread adoption. [3]
[1] http://webs.schule.at/website/European_Currencies/old_eu_cur...
Not so with bitcoin, which the IRS taxes every transaction, no matter how small.
[1] https://avc.com/2017/08/store-of-value-vs-payment-system/
And I understand that in cryptocurrency land there's always a future thing that people will use. Wake me when that happens, as 10 years in I've stopped holding my breath. Especially since, as I said upthread, other technologies in the same period have found widespread adoption.
And spending appreciated crypto, even on coffee, or anything else, is a taxable event.
So the point stands that using crypto as "spending money" vs purposefully saving it as store of value is going to be a real pain, for all of the technical reasons but also the tax complexity.
To see why this is the case, imagine someone saved BTC as store of value, then years later exchanged it for a house.
They didn't sell if for $. But they used its appreciated value to buy something. There is a capital gain involved, and so taxes as well.