"It is intended. We designed it in a way that the less assists you use the more the system forces you to drive realistically and the more realistically you drive, the faster the system let you go.
So:
automatic gearbox + autoblip + auto cut + auto clutch -> easiest -> slower
manual gearbox + paddles + autoclutch + autoblip - no autocut -> less easy -> a bit faster
manual gearbox + paddles - no autoclutch - no autoblip -> hard -> fast
manual H shifter -> manual clutch -> harder -> faster"