I’ve wondered this myself. After doing a lot of research I decided to leave mine as is the way it comes factory. reason being is our boat is kept at our lake house and it seams they smoke a lot with full premixed gas, I’m not crazy about looking like a smoke cloud going across the lake lol. Just as a Precautionary I do put very little oil in my fuel roughly 100:1 mix.judging from the performance of the boat and burn color of the plug it loves it lol. This is only my opinion, your prolly going to get a lot of diff takes on it.
Joe