Genuine question here LB - Are you suggesting that Cessna are telling their aircraft owners to run their engines 50deg ROP to deliberately reduce the potential life of their engines..? Or that there have been no advancements in the companies engineering knowledge in the last 50 years..?
The reason I ask is that the POH in the latest C182T with all the bells & whistles including lean assist etc is still recommending leaning to 50deg ROP like all the older models. Are they in denial or do they genuinely believe this is the best way to treat their engines..? (Presumably backed up by exhaustive testing and maintenance records).