So... Let's talk about post patch J4
For any jg main that haven't tried J4 post patch, take my advise, DO NOT PLAY HIM.
His clear speed is more or less the same, but now it takes like half of his health or more to clear anything in the jungle. (He's that fragile now, the increase in damage taken is very significant.) So what happens now is that you are forced to pick up Ranger's Trailblazer upgrade early solely for the sustain, or else you will not be able to gank anywhere due to taking too much damage from jungle camp. But wait, there's more, now you have to gank a lane with no chill smite and LESS ARMOR.
I have no problem ganking without chill smite but the increase in damage taken really killed this champ for me. After I tried to gank with J4, I just know I would not be playing this champ for a while. It's kind of hard to explain how bad he is right now properly, if anyone is being curious, I strongly encourage you try 1 normal game with him. And you'll understand that I'm not exaggerating a single word here, he's bad now, like, Elise tier bad.