Years ago I had a pair of front tires installed on a company car at a big local tire store. When I got the car back, it did not feel right, pulling hard to one side. I checked the pressure, and it had 6psi on one side, and 55 psi on the other.
These guys have more than enough experience to do things like this right. The problem is that they are under pressure to work fast, they can have high employee turnover, and poor workers may not be adequately monitored.. all amounting to a recipe for slipshod work.
I like to do as much of my own work as possible. I may take 5 or even 10 times as long to do a job, but t least I know what I did. While the 'lug nuts' case is a dramatic example, it is not terribly surprising..
'08 E-150, std roof, wb, 2wd - basic cleanup done. Working on rough layout of 'furniture'.
Pretty much everyone will step on their 'willy' once in a while.
I usually make it a point to stop and put on my golf shoes first..