Easy kbs = relatives to you making multiple good reads and only source of real damage.Has one of the fastest fatal blows in the game, has the ability to side switch with two special moves, Easy Kbs, good high low game, solid projectiles, and can check from long range with ground pound. This character is far from bad. LOL The meta still favors his style of play since it is center around pokes which he has a lot of. I'm not comparing Jax to the characters I listed, I'm just telling you that people haven't been trying other characters. I mean I heard from Tweedy people think Terminator was bad because he can't get in. (LOL!).
Good high low game, this is false Jax risk his life for minimal damage and the low option put jax at mid screen. most characters with good mouvement like liu,cetrion,joker can just back dash or walk back.
How side switching moves do anything for a tier list ? about 90% of the cast can side switch with simple combos or moves.
Jax is only good at low level, nobody will be playing jax at high level.