A question about Jhin's snare Riot?

Why doesn't Jhin's grenade (Q) proc the passive for his snare?

I mean last patch Riot changed it so that even the slow from his trap would activate the snare and not just when it explodes. Jhin's snare can proc from all other incoming damage of Jhin's and his allies. Why not this source of damage as well?

I bring it up cause I think it might be a huge weakness in Jhin's Kit.

1. Jhin's traps have a very long cooldown time and can only stack up to 2.

2. Jhin's reload time is obviously a weakness that's meant to be a balancing point, but if your in the middle of a reload and have no traps he has absolutely no chance of escape. ( He would if his grenade could proc the snare )

Im just saying that for a champ that has limited mobility as it is then to leave him so wide open for such a big window is a huge disadvantage especially for a Marksman.