I mean, maybe he has a point in that we're exaggerating how bad it is, but it's still bad, like really really bad. Too many characters like avalanche as you mentioned just own Jax the whole game, and I mean own in the most literal sense, if they want you to just sit there the whole game and take their bullshit they will.
That's not even the problem FFS, the biggest problem is that his offense SUCKS, it's not good enough to justify his bottom 1 screen presence. What fucking good is it to work my ass off against Cetrion just to get 11 11 11 11 11'd? or to work my way against outtake's slime spam just to get destroyed by a +6 shimmy string
why is this character that's the 2nd closest to a true rushdown archetype, fucking terrible at rushdown compared to other characters with big buttons and fast projectiles? Not right.