I think posters have done the opposite to what you are complaining about. They have not made definitive pronouncements about your engine or pretend to know whether it will last another 200,000km at 500hp on the basis of a posted photo. They just say they can't see any obvious major fault. Apart from looking down the bores there are objective tests you can do - compression test, leakdown test, actually measure the bores for wear and out of round, feel for piston movement up and down or side to side.