It serves no useful purpose particularly as far as flight safety is concerned to send out a message of no matter what you do you are not responsible.
Agreed. That's not the point of our disagreement, however.
Where we disagree is
who is to blame. You want to blame the natural born person (the mechanic) and I want to blame the legal person (the company). As near as I can tell that is the only substantive difference between us.
In conformance with hundreds of years of case law on the subject, the company is the best person to hold liable because the company is the one in a position of power. It sets the terms and conditions of employment of the employee; it hires and fires; it manages the employee.
To me what you seem to want is the old guild system back where the employee is honor bound by his family traditions to do a good job. What rubbish. Come into the 21st century.