It’s all about the ratio. The density does not matter as much as you seem to think. Plus there is a tolerance built in. Just think, you so carefully measure everything out with weight (did you get the weight exact?). Then you randomly toss a bunch of bench flour down when you kneed the dough. You have literally no clue as to how much weight of flour/semolina the dough picked up. So it really doesn’t matter as much as you might think. Now your scale does make it easier for you. And that’s fine, I have a kitchen scale and use it regularly myself. But I understand it doesn’t matter as much as you seem to feel it does.

And again, those Italian Grandmothers are just eyeballin’ everything anyway.