Reputable shop...lol.. A lot of mechanics get their start doing oil changes at dealerships. Then as they prove out they can change oil, they move up to brakes etc. Often without any formal training. And to hang an ASE sign in the window..only one guy needs to have passed the tests.
With that said.. some of the guys I've seen do amazing work, have never had any formal schooling. They follow the procedure because it is the best way to do something.
You wanna see a hack.. find guys losing money working flat rate and you'll find some of them doing stuff poorly.