That's historically wrong. When Bitcoin was initially launched, it took a long time before it started being used in economic transactions (see the famous 10,000 BTC pizza). It took an even longer time for some merchants to start accepting it directly or through a payment processor. Adoption by merchants was close to zero for a very long time.

Today, you can not only easily trade BTC against other currencies but also spend them at many merchants. There's even a country (El Salvador) that has adopted it as legal tender. These days, the daily transaction volume is in the multibillion dollar range (and that's just counting transactions that are settled "on-chain").

Is your objection that since it is less commonly adopted than USD, it therefore has lower utility than USD? Or that its utility was higher in the past? I am not quite sure I understand your question or argument.