“if you can find me one published report that in any way points the finger I will change my view.”
Have a look at the G-STYX report.( It has since been shown the repair was not responsible for the accident.)
The POH in most aircraft are 40 years old. I have seen POH which specified “do not lean below 3000 ft”. Times change, fuel becomes very expensive. The engine manufacturers change the operating procedures for your engine. What do you do now, follow the Engine manufacturers advice on how to operate the engine, or the airframe manufacturers 40 year old advice. There is no “right” answer, understand the context and make an informed choice.
Rod1