Too much.
The law is already on the books. - Careless driving.
To try to break it down to each and every thing that could contribute is stupid. Different people have different capacities.
But I can shave without looking.
I can talk on a phone without losing concentration.
What about drinking, eating, rubbernecking, smoking, etc.
If a person isn't paying attention, give a ticket.
Of course I agree with the makeup thing.