Bitcoin is money. A money's purchasing power is one of its most important characteristics. Humans need food, shelter, clothing etc. for their limited lifespans. They don't 'need' money, except to exchange it for things of real value. So if you can purchase less food today than you could 6 months ago, it matters.

As Saifedean says, number go up is bitcoin's best marketing attribute. Hopefully we haven't lost that with wall street playing their fiat volatility suppression games, like they did successfully with gold for decades.

The price is the score and the reason why 90% of investors care about Bitcoin in the first place. The platitudes are not honest IMO. If Bitcoin was $5 I don't believe people would be on here posting about it all day every day after 15 years.