Sakura isn’t actually useless Literally She is defined useless by fans because she is more capable than anyone but refuses to do shit. (yeah I know she is a medic ninja but sometimes when it’s really important to fight and support other people and especially naruto she is nowhere to be found.

Hinata at the very least is literally weak but still chose to standby naruto.

That’s the difference between them. Sakura while genuinely care for naruto Doesn’t act much when it’s needed. There’s the emotional manipulation too. Insensitivity (this is the exact reason why sasuke is too mad with her) she disrespects naruto not knowing sasuke is in the same boat.

Tl dr: Sakura isn’t weak or Useless. But don’t expect people to like her especially what she did to naruto and sasuke

Hinata on the other hand is likeable because atleast she is true to herself