Have not had issues in any motors yet. I have a bunch of them, since I have a bit of a collection, from Jaeger through Briggs, more Briggs, Power Products, Johnson, Tecumseh of varying ages, Wisconsin, etc, etc. All work fine, no shellac in any of them, so no issues with alcohol.
You cannot let recent gas sit long in a carb unless you have stabilizer in it. . A couple weeks seems to be no issue, much longer and it will not even smell like gas. Over winter in the can and it fif not smell or work like gas. With stabilizer, it lasted all winter, smells like gas, and works fine.
Got a mower given to me, "does not work, we're tired of it". Almost new "Yard Machines" mower, not what I would buy, but hey, free. Checked it out, and sure enough, runs with gas down the spout, not otherwise. Popped the plastic carb apart, cleaned out the pinkish crystals from the jets and it started in two pulls. I run it out of gas for storage, stabilizer or no, but with the stabilizer it is fine for three weeks at least, no issues.
Thought I was wrong about that, because it started badly and had no power this year. But when I took the carb apart, I found a piece of crud was clogging the jet. Removed that and all was well. Needs a fuel filter, most likely, that I can do, there is enough fuel line free of obstructions on it.
Gave the old mower to a friend's son who just bought a house. kept an ancient one from 35 years ago, it always works, even though the neighbor seized it up once by filling the tank to the absolute top, and having gas dilute the oil.... A musician, no mechanical sense, but he'd borrowed it before with no issues. Both those run on current pump gas just fine.