Suppose that it is pretty easy to look at money printing and figure out how much devaluation results (eg: prices will wind up 10% later).
Even if that's true deciding when to raise your prices (and how much to raise them) has a lot more to do with supply (of your inputs) and demand (for your products) and also what your competitors are up to.
EG:
- you raise your price now, but your competitors raise it less; they take a lot of your business pretty easily
- your customers haven't gotten "their share" of the printed money yet (eg: wages haven't caught up with the devaluation, or they haven't raised prices proportionately yet, etc.) so you lose more by raising prices than you lose by leaving them as-is
...that kind of thing.