Ethanol collects moisture. That alone is an issue.
But consider a cart that is used sparingly. Every month it gets down to half a tank, and owner fills the tank with 10% ethanol. That means half of the ethanol remaining in the tank is beginning to get old.
Another month goes by, another half tank fill, and now a quarter of the tank is getting very old.
Next month they go on vacation. Tank sits longer.
Now problems start to fester. They think "I fill it every month"
Now consider if the tank only needs a gallon or two. The old gas is only partially diluted with fresh gas.
Blanket statements of fuel type use often leads to long debates that lack factual reasoning. For the original "it's fine" to use theory, keep in mind that applies to fuel injected carts, getting enough use to significantly turn over the tank contents within a couple months, that is not left sitting for long periods of time, etc.
Every case is different.
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