In my workfow I mostly use opposite effects in the Graduated filter and Adjustment brush.
Lightroom maintains "least used effect" even when changing tools.
Is it possible that each tool retains its last used effect?
In my workflow I mostly use opposite effects when using Adjustment brush en gradient filter. Changing the effects wastes a lot of time when editing hundreds of images.
I agree that it would be nice if the individual tools remembered their own last used preset.
Unfortunately LR does not work that way.