The thing about acceleration is that it loses its thrill after a while. Of course the first time you are in a really powerful or fast car, the acceleration is impressive and seems like the most insane thing in the world, but after you do a few launches and use that speed regularly for a while it doesn't seem as impressive as it originally did. Once you find the most possible traction that's that.
Cornering on the other hand, is different every time. Even if you are doing the same corner in the same conditions with no other cars around to mix things up, there are many variables and different ways to take the corner. Even if you are solely focused on lap times, you can always try to improve and take the corner in a more efficient way. At the end of the day, acceleration is about what the CAR can do; cornering is about what the DRIVER can do.