It does work like that. It absolutely does work like that.
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I’ve seen them break perfectly good parts. I’ve seen them forget to put parts back on. I’ve seen them leave tools under the hood. I’ve seen them lose parts.
Allow me to share my favorite story of dealer tech ineptitude. They changed the oil on my tundra, during that simple job-they managed to dent the transmission fluid cooler, which is several inches in front of where the skid pan goes. I don’t know how they managed to hit it. Then, they lost the bolts that held the pan in place.
So, then, they at least they put a new bolt in.
The bolts were still stuck in a magnetic dish that was on the frame rail by the transmission Cross member. So no, they didn’t actually lose the bolt. Well, I guess they did, but the bolt was stuck to the bottom of the truck.
Did they tell me about the lost bolt? No, of course not.
Did they fess up to denting the transmission fluid cooler? No, of course not.
No part is built strong enough to overcome the breathtaking ineptitude of mechanics that I’ve seen work on my vehicles.