If the price is fixed to Bitcoin and not to fiat then it changes the equation a little bit but there will always be volatility in crypto and you are right these things matter to those using crypto or newbies that are considering using crypto.
I think the OP was interested in knowing about using it as a method of payment rather than use it as a tool for holding or investing.
Having volatility issues is one thing that doubt others to use bitcoin as a payment method because it’s price keeps on changing and is never fixed. And to think that bitcoin is much better when used as an investment rather than spending it like fiat, then it’s not surprising that most traders would want to hold and trade it later since they will surely benefit huge profits from it.