If you're a bruiser getting one shot by kha then you mostly fucked up pretty bad.
Love when people say stuff is overloaded then just list off they kit like that some how means anything.
Kha needs basically everything in his kit to function as a champion that is not my opinion that is a fact. Like look at his kit,numbers, actually think or play the champion then remove the thing you are calling overloaded and what you will most likely find is that he needs it.
Also winrate means nothing like kha is a assassin meaning along as he is not terrible he will always have a high winrate.
Like is he is not op pain and simple the buffs they give him were not good enough to make him op. Kha looks good stat wise because the buffs helped him and the meta is good for him. Like compare kha and j4 and you find kha is lacking a lot of what j4 can do but j4 can do most of what kha can. The only thing kha has over j4 is a escape and a better snowball nothing else. They both can burst down champions, they both can gank really well, good clears, but j4 is tanker, has more damage not just burst, more utility and can do stuff when behind.