It’s all for nothing if it doesn’t meet air quality standards. Many 2-cylinder engines don’t meet spec in that area. Just look at all the small-displacement engines that have gone 4-stroke in recent years.
IMO, we need to decide which is more important.
I’m no expert, but soon after the advent of 4-stroke outboard motors, there was suddenly an awful lot of very fuel efficient and low emission 2-strokes coming to market.
2-stroke technology has come a long way from the old blue-smoke spewing rattle monsters. Though they did and do run like a bat outta hades.