I believe the accurate answer here is twofold:
- money is perpetually not supposed to be a great perpetual store of value relative to goods and services. Government policy aims for some inflation, fears too much and fears too little. Why? Because a bit of inflation is an incentive to use your money on more productive asset - eg don’t hold on to it but instead invest in a startup or go use someone’s services or goods (go to a restaurant!). The issues happen when inflation is so high that the money melts away before you have time to figure out how to use it productively. Deflation is also bad because then people stop spending on services, stop investing - and just hold onto money. (“No I don’t want to invest in this startup! I have the best investment I need, just holding onto my cash!”) That slows down the economy.
- either way Bitcoin doesn’t solve inflation in any way. It’s just another asset - that can go up or down or whatever, and happens to have gone up for a long time (just like Facebook stock) and then dropped a lot. Just like any stock or any asset, Bitcoin can have higher-than-inflation real returns or lower-than-inflation. And more recent returns have definitely been lower. What will happen in the future? Who knows. Same answer applies to the S&P500 and to Gold and to the new condo in my neighborhood.