It's a good point. What makes a Bitcoin standard hard is that your whole financial network needs also to be on the Bitcoin standard for it to work.

As long as you need to take or make payments in fiat, you need to manage the streams in and out of your private Bitcoin standard bubble.

And on top of that, until price volatility in relation to real goods is still high, that's a big barrier to people wanting to accept Bitcoin and hold it for day-to-day expenses. They need a currency with no risk of sudden, sizable devaluation, hence USD stablecoins, despite their inflation.