Nylon cams, sheet metal cams, bearingless engines are the result of some idiot trying to reduce cost. It sure seems like low cost wins out over proven technology and good quality way too often these days.

The Shindawa (YS gas motor) sure looks interesting. I would propose that someone make one as a boxer twin with a flathead design (valves in the block) to narrow the engine. With the crankcase supercharging, it needs a low compression ratio anyway - low compression works fine with a flathead design as it unshrouds the valves. Roller tappets on an induction hardened steel cam, cam riding in needle bearings.