Lecithin is an emulsifier, so it helps to bind water and fat, which usually repel each other. It's nice, but not essential when you make gummies, or chocolates, or something else that has both water and fat. Without it, there's a tendency for the gummy and cannabutter to separate a bit in the mold while in the fridge/freezer, but they still work the same. Some people say lecithin makes them hit faster, but I haven't noticed a big difference. Stir immediately before pouring into the mold, otherwise it will start to separate in your double boiler.
The ones below are melted Black Forest gummy bears with cannaghee, no lecithin. They've separated a bit, but I keep them in the fridge, so it's not an issue. The ghee doesn't have a strong butter flavor, it's pretty neutral.
If you want to keep them out of the fridge, definitely use lecithin to keep them blended. They'll be stable at room temperature for quite a while. Blended they come out about the consistency of a Starburst.
Lecithin is not necessary if you are making cannabutter/oil, rice krispy treat variants, green dragon, or RSO, only for things like gummies and chocolates.
Always decarboxylate before extracting using any of these methods, or the THC/CBD won't be activated. Decarb is where the Ardent excels. It has a decarb setting for THC and one for CBD. You can do it in an oven, or instant pot, but you'll lose a fair bit more of the THC/CBD in the process.