The more I learn about the MOSAIC light-sport aircraft certification rewrite announced by @SecDuffy at Oshkosh, the more exciting it seems. Acknowledging the long-accepted industry view that existing Part 23 certification has added cost and inhibited new technologies, the new LSA certification regime (almost a self-certification regime) allows for aircraft with a flaps-down stall speed of up to 61 knots, up to four seats, cruise speed of up to 250 kts, no weight limit, night flight and (it seems) a path to IFR. Much of the interesting light-aircraft innovation like new materials, high-efficiency Rotax engines, and modern avionics has been happening in the Experimental Amateur-Built (E-AB) regime. My hope is that the new MOSAIC regime allows these interesting new aircraft to be sold directly to pilots and displaces the legacy designs that are too long in the tooth.