To avoid sugar in your food is way easier than avoid ethanol in your fuel
Since 6 years I quit eating sugar, lost 44 lbs over those years, it's that easy to get from 95 kilo (209 lbs) to75 kilo (165 lbs).
But in those same 6 years it took a lot of effort to find ethanol low or free fuel. Especially in Germany it's almost impossible to get low ethanol fuel for my 1966 CB450. However, I did change as much rubber parts in the fuel system as I could find / make them myself, being on the safe side, and dyno'wed the bike to find the best adjustments for the carbs.
With ethanol, fuel lines getting too soft, resulted in knicking at some point, especially at the CB450 were the routing of fuel lines requires some short bending radius. Re-routing the fuel lines was the only way to connect the carbs with the fuel cock with the ethanol resistant thick fuel lines.
With the build up of the CB400F I count in the effects of ethanol containing fuels, replacing all rubber parts and gaskets for ethanol resistant rubber and gasket material.