For purposes, like:
Lumetri Color, exposure slider from -7 to 7 what If I need more of it,
Radial Blur what if I need more then hundred but within one controllable center,
Transform FX, what if I need just to double offset per layer by index but still want to maintain general offset controls for all of them, and one last I'd like to go opposite direction...
Imagine How easy would be offsetting values linked to expressions by just duplicating the needed parameter inside layer dropdown menu, just like inside the compositing option right now has mask input that could actually be duplicated to add more effect masks...
I see great improvement on user experience with modular expanding of effects like this.