I don’t disagree with you or Mustangman.
One reason this came to my mind was that earlier this morning I purchase four NGK ZFR5F-11 plugs for my wife’s Acura. Those are the recommended plugs per the manual. I paid $2.49 a piece for them and they have a 30 days “warranty”. I normally would have purchased something of higher cost/quality and a better warranty, but I decided to follow the manual this time and find out how good/bad they are in the long run.