It's true that Hook Fist is not as good as God Fist. EWHF doesn't crush shit and while wgf launches whenever it's counter or normal, slow or electric, whatever, Whf is electric or ch just now.
Besides WHF since it was created had different purpose then standard electric. It was solid, damging move that pushed opponent away for a wall or oki preasure. That's why it was always safe too, -6~7 in non electric.. Even in 7 it retains most of that purpose with auto screw.
Other thing is besides having formidable crouch dash and wave dash skills, Jin often relies on stuff like hopkicks, parries, stance, f+4 etc. Not really standard Mishima stuff. His CD4 doesn't have the speed or range of hellsweep.
So he's kinda mishima kinda not. Like intended.
Ironically I think Jin is insanely good. Great frames, so super hard to launch punish, shitload of plus frames on block. Billion launchers. Parry, b+1, uf+2. Played right Jin can't be touched.
Saying he's well rounded is an understatement. He's a monster.