I don't think silence should stop physical abilities.
There i said it. I think it's silly that i can't swing a sword or an axe harder because of a silence.
Take any physical AD person, Garen, Dar, Yas, whatever the case be. Oh dear oh my i got silenced, i can't swing my sword harder now xD i just don't get that. Didn't know silence was in the same category as physical movement v...v.
I mean WoW even has it where silences don't do anything to physical abilities, because it just makes sense xD. Most games have it that way actually now that i think of it.
Think perhaps with the amount of cc in the game, it might be a smart move to maybe tune it up and do some minor reworks to how some forms of cc work against certain "classes". EX: Silences can't stop you from doing a physical ability, like twirling your axe, and swinging your sword a little harder...
Just an idear, would help immersion and tune down frustrating amounts of cc that doesn't make any sense at all.