In TFA, the author says "agency" not "full agency." I also can't find all these other issues (jobs, etc) in TFA. Where are you getting this?
Just because there are adults that abuse their agency of the use of alcohol (alcoholism) doesn't mean we should remove restrictions on young people.
Just because there are adults with full agency who drive recklessly doesn't mean we should allow 13 year olds to drive cars.