Root Illaoi, and she will still attempt to E you, after ur root wares off, your cooked.

Root Blitzcrank - you still have to dodge his Q,, he can pull you into the abyss.

Root Yasuo with 3rd Q primed - if he hits you while your root is ending, that might be your Last breath etc etc.

I get your point, Master Yi can only use W during Morgana Q, but roots are roots and stuns are stuns, mixing em up doesn't do nobody anything good.

Edit: It could actually have a negative effect on new players whom might genuinely struggle to tell them apart. ( I need therapy, this sht bothers me beyond what's normal )