TSBs are not always things to be fixed
Remember that not all TSBs are things to fix, these are things that some customers have complained enough about to alert every service department that there is a problem, even though there is no fix.
Here are a couple of examples:
PG005-03 AUG 03 Wheels/Tires - Spare Tire Carrier Operation
EL010-03 JUN 03 Instruments - Difficult to Read
EG007-02 MAR 02 Valve Cover Oil Baffle - Damage Prevention
SS002R-01 JUN 03 Engine Controls - ECU Flash Reprogramming Process
The moral is (as afore mentioned): If its not broke don't fix it.
Generally they won't implement a TSB just because the customer says so, there has to be a reason (ECU would be reprogrammed for service issues, AC blower motor would not be fixed unless they saw the icing occur, etc)...
On a side note, all mechanics do have required continuing ed for all vehicles every year. Most dealerships cannot afford to hire 100% mechanics so they supplement the work force with some "experienced labor" (the 18 year old you mentioned). A mechanic will sign off on the work (if any is done), but usually these guys are doing the oil changes, tire rotations, brake service... routine service stuff. This frees up the trained mechanics to do the more difficult and more lucrative work.
If you have issues with the dealer, take the car to the service manager or to the dealership manager and ask if they treat their car this poorly. Usually the dealership manager will remedy the situation quickly.