I believe a fixed supply of currency is beneficial when determining price. The ability of an institution to secretly change the amount of a currency used to measure price introduces yet another variable into the valuation equation.
Additionally, when the dollar was fixed on the gold standard, employers needed to be upfront and honest with their employees. When they needed to cut wages, employees knew it was happening. Much of the labor movement and union formation happened because employers needed to be honest about what they were doing.
I've yet to hear a convincing argument that inflation is good for me.