Tryndamere is still unbalanced.

He has

Built in crit chance Built in sustain, and a damage steroid Cc, with ad reduction A lot of mobility, which has a reducible cooldown. And Invulnerability, which can be cast even if ccd.

He can 1v5 a team that doesn't have cc. He can kill almost anyone he wants under tower, as long as he has ult up.

He has good sustain with just his q. which becomes ridiculous sustain after his first back, where he buys scepter, at which point he becomes impossible to trade with as he just heals for any damage you do.

His e lets him cover more ground than a fizz e.

His invulnerability lasts longer than any other invuln in the game.

His weakness is hard cc, but even that can't always help. You need a team with a lot of cc, so you can just chain it onto him for the duration of his ult, which lets him win almost every 5v5 situation he's in. And yes, it let's "him" win it. You could obliterate everyone on his team, and if you didn't focus all your cc onto trynd, you lose, because with his mobility, he'll be on your adc, then onto the cc of the team, then onto the rest of the team, acing them even if they've retreated under tower. The only time i do well against trynd is when I'm on a team where at least 4 of the five people on the team have some form of hard cc or a root. If we play a low cc team, high damage output, we lose. He's sorta like riven, only worse, because you can cc riven under tower and kill her. When you need to pick certain champs just to deal with a certain champ, shouldn't they be considered unbalanced?

I think removing one of those things, like his sustain or mobility or cc - cuz the ult is sorta what makes him him - would balance him..