A French press ratio expresses the relationship between dry coffee and brewing water. Writing it by mass removes much of the ambiguity of a scoop, whose capacity and filled weight can vary with the coffee. A recipe such as one part coffee to sixteen parts water is a starting point to evaluate, not an instruction that every roast or drinker must prefer it.
For example, twenty grams of coffee with three hundred and twenty grams of water makes that relationship easy to repeat. Keep the grind, water temperature and steeping routine stable while judging the result. If you change the ratio and the grind together, it becomes difficult to tell which adjustment affected the cup. Remember that some water remains with the grounds, so beverage volume is not the same measurement as water added.
Taste for both concentration and balance. A drink can seem strong yet still have an unwanted flavor, and adding more coffee is not a universal remedy. Write down the ratio that suits a particular bag, together with the rest of the recipe. This turns personal preference into a usable brewing record rather than a debate about a single golden number.

The conversation
A good question can make a better brew.