Earlier quoted context omitted.
Ethanol also sucks in water from the atmosphere which causes big problems if not adequately managed. Especially ‘back in the day’, the technology to do so was very poor - even keeping a gas tank somewhat sealed against rain was difficult and often didn’t happen well. Modern plastics, better valves, better treatment chemicals all mean it’s less of a problem now - but it is still a major problem and kills a lot of smal…
We did have the tech in the 1960s to make gas tanks that were sealed against the rain, actually. While yes ethanol is hygroscopic, 10% ethanol won't cause issues even in old vehicles (see people with old motorcycles) unless you keep it in for a long time without use.
If running ‘pure’ ethanol, it’s still really hard to not have engines die or fuel handling not contaminate it. It’s not an easy thing to keep pure enough, and is even a bit corrosive compared to gasoline.