Well yes, but it's a matter of perspective I think. Is it the amount that the recipe author used? Maybe, maybe not. But is it the amount you used the last dozen times you used this recipe? Of course, as long as your chart hasn't changed.
To be clear, I'm not disagreeing with your general premise, everything would be much easier if all recipes used weights for powder-like-ingredients. But recipes that actually have weights listed are few and far between, I find.
There is no (serious) baker that use volume for flour. If the recipe uses volume, it is flawed and you should find another recipe.
Every recipe on King Arthur that you linked has weights.
I realize how I sound, but there is a very big difference in a couple of percentages of flour, and you'd definitely mess up a beginner with the difference with the amount of flour.
To be clear, I'm not disagreeing with your general premise, everything would be much easier if all recipes used weights for powder-like-ingredients. But recipes that actually have weights listed are few and far between, I find.