True, it is legal under state law in MO, but the federal law supersedes it. So, it is still illegal. And it is very unlikely that what happened for beer and wine will ever happen for spirits. Part of that is historical, it was legal to home brew, but always illegal to make spirit with license and taxation for most of our country's history (c.f. the whiskey rebellion). And, you pretty much can't enforce "no fermentation" since things will spontaneously ferment. But distillation generally requires an intentional manufacturing process.