I've told this story before, here. Some years ago, after harvest on the farm, my dad and I were a bit bored, and glanced at the tiny, long retired grain auger in the scrap heap. It had been sitting out there in the open, unused and uncovered, for many years, probably a minimum of 15 years, possibly 20 or 25. In any event, it had a little B&S engine on it, and we decided to get it running. Note that it was in a scrap heap. It hadn't been run dry. It hadn't been treated with Stabil. No one fogged the motor. There wasn't a fresh oil change when it was dumped there. It wasn't kept out of the elements.
We got the thing running like new in an extremely short period of time. A rinse of the fuel tank with fresh gas, a bit down the carb, fresh oil, and a wire brush to the spark plug was all it needed. Now, I dare you: Buy a brand new mower, and run whatever you want in it, E10, E0, racing fuel, or whatever, in whatever combination you want and treated with Stabil or whatever else you want. Turn the thing off and toss it in the scrapyard for 15 years plus. Then, let me know how it turns out when you go to restart it.
And you've hit the main point. Ethanol didn't just happen yesterday. It's also not a secret. Yet, OPE manufacturers and lazy OPE mechanics just love to blame ethanol and act as if they're facing the single most monumental engineering challenge in history.