Price is information. Inflation/deflation corrupts the information.
Unless the Inflation/deflation is relatively stable. Inflation/deflation has been more stable since the Federal Reserve was created than it was during the 1800's when we were on a gold standard.
The only difference is that under the Federal Reserve the direction has been mostly one way, a slow inflation. That makes the currency not a good store of long-term value, but you shouldn't use currency for that anyway.
You have inflation/deflation on any monetary system. It was worse on the gold standard. You had huge swings of 20 to 25% in a year.