Who do you think docks their uncrewed dragon capsule?
They definitely have automated docking. This is for emergency manual override.
As far as I know it flies autonomously to within a certain range, then gets piloted by crew members on the ISS until it's close enough to be grabbed by the Canadarm for berthing to the station.
Its because astronauts want to have something to do
This is actually a legit answer. It's the same exact reason why the Space Shuttle relied heavily on manual flight controls even though it fully supported almost-entirely-automated flights like the Buran did. Astronauts seem to get more satisfaction out of actually flying their spacecraft rather than just riding in 'em as passengers.