There is some merit to your point, but I don't completely agree. STEEM does have built in inflation. At around 9% per year. So supply is increasing. But in a predictable way, that everyone knows in advance. After all, the rewards pool has to come from somewhere.

But to compare it against USD fiat is slandering STEEM. The printing presses for USD are turned on and off in an arbitrary way, and the amount of printing of USD is criminally large. More than double over last 10 years.