Wouldn't a 'perfect' currency/money neither appreciate nor depreciate in real value?

Right now we have an inflating/depreciating currency which fucks everyone, especially the middle class.

Bitcoin is a deflating/appreciating currency/money. Wouldn't this create its own set of problems?

Wouldn't perfect money neither gain nor lose real value? In other words, in some magical world, the currency/money expands and contracts directly proportionately to the population's expansion or contraction and also proportionately to currency/money being destroyed thus maintaining a neutral value always and forever? Talk about a complicated calculation far beyond me... but yeah. These are things I think about.