I feel like people aren't realizing the entire thing about Yi and Sated was the attack speed and the fact it made his true damage INSANE. He destroyed anything and there wasn't much the enemies could do but build health, which was then chunked by the BotRK he'd have after the sated. They decided to make it to where he instead gets 3% max health per hit as phys damage.
Honestly, I've already tried him on the PBE and he does perfectly fine. In fact, tank killing is hilarious. Bloodrazor does quite a lot of damage and it's enhanced by armor pen, which also enhances BotRK. The only actual loss here is Rageblade which has been causing many issues with Irelia and Jax on top of Yi. Just get a decent build like Bloodrazor->BotRK->Ghostblade if enemies aren't building too much armor or you're able to get to their backline, or go with Lord Dominikk's so anyone who has health items gets to be murdered because you'll have 3 items that say 'HAHA, SCREW YOUR HEALTH ITEMS'.