I think inflation exist to keep the people under control through a wealth gap.
Inflation is needed for growth and to make up for interest rate and tight labour.
Interest rate and inflation can not exist without each other.
The reason why banks have interest rate, is to recover time value lost through inflation. That is how banks make most of their money. Without inflation, how would the justify charging rate?
The current monetary system is based on growth, inflation and rates, which need debt to exist. Perfect sense if you are a bank.
So that is why we need inflation for what I understand... and rate... and poverty.