overthewing,
I agree with your view...
Once upon a time I had an inspector's stamp (yes, Concorde, but in the earliest days).
Being a small team, I also regularly stuck my own hands into a computer to do modifications.
Whenever that happened, the stamp stayed firmly in my pocket, and it would be a collegue (with his own stamp) who'd inspect my work.
Self-certification was an absolute no-no.
And the final responsabilty was with the person whose stamp was on the seal, and whose signature was on the 'certificate of conformity'.
The fact that it is apparently OK to have one person sign off his own work, when that work is a repair to a passenger aircraft, is alarming to this passenger.
It's alarming to this engineer, too....
CJ