Many years ago I always used oregon 2 stroke oil, I believe it was semi synthetic but not 100% sure, it was in 80's. Saw was used regular for limbing (husqvarna 254) very reliable and never any trouble. The saw was stored and not used probably 20 years, started it rabbit cutting some wood and thought it would be a good time to strip it give it a good clean and put a new piston in it just because I had a new one in the box. Took the cylinder off and couldnt believe how good the piston was and a nice coating of oil inside. It was always run 50/1 and looked after. Still use that saw but now with fully synthetic, still runs clean not as much oil inside but no wear. All the talk of this oil is better than that oil makes me think today's oils are much better than years ago but "maybe" the fuel is much worse. I cant remember fuel lines failing anywhere near as fast as they do these days but of course that could be down to the rubber also?
Like a lot of things these days, we are "told" this is best that is best and being gullible humans we all go along with it. If you read its right then it has to be right......right