People keep forgetting that the Snes mini, Nes mini, Neo-Geo Mini, Playstation Mini are nothing but toys. Something you give your kid, hook up to his TV so he could enjoy some of the games that you enjoyed back in the days. These emulation projects aren't meant to be taken seriously.
The Neo-Geo mini was a quick money grab. Of course there are skillful passionate Neo-Geo guys out there that could build something superior but Snk wasn't going to put in that effort.