Deflationary tokens have one use case i.e. good to create price volatility. With time as supply of coin will go down we will see swing in price of coin. That will defiantly take some time but will happen at least once.
Can you provide an example of such a case with any token? because I myself also very rarely find such things at this time and also in the past, so I need an example so that I can understand it more clearly.
Biggest example is bitcoin which started its journey from 0$ and has controlled inflation. Its current price is mainly because of controlled supply and huge community behind the project. If there is no single example that doest mean that no new coin can perform.