I've heard this about Fusion & without knowing much, it sounds a bit dodgy to me. What does turning off history accomplish? Faster rebuilds? That seems shortsighted because of more significant downsides as mentioned. Equation driven dimensions have nothing to point to. Same for design tables. The worst downside is trying to diagnose something in the tree, a sketch within a feature within... Its like throwing away your GPS on a drive because it weighs too much LOL. (Start with the wife's shoes, plenty more where those came from haha).