The problem is that certain champs have so much more self peel than others.
Let's compare 2 adc as that's who you guys hate the most.
Tristana
Self peel ult, Big dash with a reset.
Jinx
Chompers that take a full second to arm
While lowering movementspeed would help a bruiser against both the champion who already has trouble getting away once you're on them gets screwed over much much more.
Then there's crap like bitch ass fiora who runs faster than an ulted Yi/Singed, like WTF why is she running faster than champs whose design is partially about being fast.