I am definitely not the most experienced person to tell you about Presets, but for what I know here goes; It's pointless to create one as of now because with the upcoming revamp of LM, there will be new models. Which means new UV Maps (the canvases you use to create a preset for a character). I'm pretty sure Myz is making something so you can have certain types of people able to see your preset and other not. If that makes any sense lol.