If you're seeing from the perspective of bitcoin maxi, 1 bitcoin is 1 bitcoin and if we don't depend on fiat system too much, the volatility doesn't exist.
The problem is that you can't disconnect that easily from the fiat value.
Let's take a place like El Salvador's Bitcoin Beach, with many businesses accepting Bitcoin. I'm sure they will charge you more BTC for a hamburger on a day where Bitcoin is at $60,000 than at a day where it is at $80,000, even if they can sometimes pay some employees and perhaps even wholesale providers in BTC.
We could imagine something more extreme of course, let's say some kind of Bitcoin island where all businesses without exceptions accept Bitcoin. They could perhaps charge "static" Bitcoin prices for each other. But as soon as a good they sell has at least some component which needs to be purchased from abroad, it becomes much more difficult.
Neverless I'd be very interested in such experiments. Another idea could be non-material goods with static BTC prices.
For example an artist selling music could attempt to charge static Bitcoin prices, which would lead to them accumulating BTC in bear markets. But in peak bull market / ATH territory their sales would be much lower, that's the problem here, and thus I don't think an artist could sustain that idea for much.