Ian uses the forum to unwind. Motoring is both his occupation and his hobby, he mostly comes to the forum to relax after spending all day at work - he does not come to the forum to do more work. This is probably true for all of us.Burying your head in the sand and avoiding discussions because they are stressful isn't a good sign. If we all did that at our places of work we wouldn't have a job for long .
I wouldn't wish ill-health on anyone, however I can't see things will resolve themselves by avoiding the issue.
What we are talking about is the equivalent of going to the pub after a day of work to find some customers waiting for you at the bar with a list of complaints for you to address. I am not saying that this is the wrong place to post feedback about the work that has been carried out by specialists and mechanics but that to expect an employee or the proprieter of those businesses to enter into discussion in public about an oustanding problem between two private individuals could be too much.