Updates for drivers is a very important feature!
Where users can go to any app website and download and install a new version, for drivers this is a bit more complicated.
Users have to search for the correct driver (correct hardware, correct OS, correct version like x64 or x32).
Even I have problems doing this (so I don't investigate the time) and I would estimate my skills to quiet well.
Next driver updates increase the stability of the system, increase the security and also offer new features.
So in my opinion a driver scan is a very important feature!