Two main reasons I think Yorick is one of the worst champions in the game after the rework.
First of all Riot Phroxzon said Yorick is one of the deepest played characters in the game meaning that almost all Yorick players are OTPs or at least mains. His winrate is stupidly low for a deeply played champion and the delta between casual players and mains is not enough. The primary reason is that Yorick is probably the lowest agency champion in the game, so a Yorick player cant transfer macro skill such as wave control while the champion microgame is also not high enough to make up for it.
1- There isn't a single champion who is unable to freeze and to slowpush, Yorick not only can not do those things but he is also forced to hard push every single time. That's frustrating for the enemy laner who cant get out of tower and it makes Yorick a worse champion at the same time (free farm for the enemy).
Now, the second problem and IMO the most important one given the fact that the rework wont be reversed: Ghouls not only stops being a part of Yorick's kit past 20 minutes, they actually help the enemies.
Can anyone here think of a single champion who has an ability that not only is bad in the first levels, and doesn't scale at all, but also actually helps the enemy in lategame? Only Yorick.
Its okay for ghouls to take x2 damage from melee auto attacks and full damage from ranged auto attacks, but life steal shouldn't be 100% effective against them. Right now any melee champion can fully recover the hp they lost from ghouls just by killing them, and then they actually get more hp than before from the minion wave.
Yorick can only deal more damage than the sustain from ghouls if he has almost an entire item of advantage. And even then, for 900g you can play under tower since enemy Yorick will hard push no matter what, and make poke 50% less effective.
In lategame melee champions with lifesteal are not worth facing anymore and ranged champions with life steal can heal up to 700 hp from ghouls. So good luck trying to teamfight. The rework was supposed to help Yorick's team fighting potential but now its worse.
Cait healing 1700 hp from ghouls. She had one and a half less items than Yorick in this clip.
Life steal should be 80 % -> 30% effective against ghouls, scaling with levels.