Less seals means better chakra control(ex one handed seals )
Naruto: Rasengan + 1 second KB hand seal + Power up modes
Sasuke: Chidori + Eye powers
Sakura: Ground punching
Kakashi: KAMUI SNIPE
A large majority of the cast have ability and jutsu that require no seals and has a low cast time
So you're saying Itachi had shitty chakra control?
There was the water dragon jutsu with so many seals
And Kisame just uses like 2 to 3 seals
Kisame doesn't even use dragons.