Or maybe its just something we need to understand by that bitcoin is more of a volatile currency than being an inflationary one, talking about inflation, this obeys a particular law of the centralized economy controlled by the government and we cant say that the increase in the bitcoin market price and fall in it should appear being the same as the economy inflation whereby goods and commodity items only rises and failing to fall.
Inflation is bad, hyperinflation is worse but deflation does not mean better.
Talking beyond Bitcoin as it is inflationary, altcoins have coins that are deflationary through buy back and burn programs, but you know that altcoins are weak and most of them die with time. Buy back and burn programs to create deflation won't help weak and useless altcoins become usefulness and have values.
Inflation of fiat currency and decrease of fiat currency purchasing power mutuallly correlates with Bitcoin price. It helps Bitcoin price grows up very shaprly by effect of Bitcoin adoption growth, more demands, higher value, and from decrease of fiat currency purchasing power. It has double effects on Bitcoin price in long term.
https://charts.bitbo.io/satoshi-per-dollar/