An oil change every 75K on a manual box, doesn't get any cheaper than that - no flushing and judder to worry about.
I struggle to think what else your mind is involved with when you are driving that you can't spare a few brain cells to change gear - messing with a smart phone, dabbling with dash screen display and all the other 'important' stuff. I know some people take a test in an automatic because they can't synchronise their hands and feet and will never master a manual box.
For some a car is just transport, and no doubt they will be the first to buy an autonomous car, but some people still actually enjoy driving.
I have had auto's before (in countries where a manual box was a special order), I have nothing against auto's - just not for me yet (maybe when I move house into central London or when my legs can no longer press the clutch I may re-consider).