Ok so here's the quick and ugly of things. I'm into 1/5 scale rc. I also love chainsaws and just about anything with a 2 stroke. In rc land our 32-35cc engines typically dyno between 7 and 9hp. Very high rpm (21k) and high load demands on them. So most guys go crazy with 30-25 to 1 oil ratios. Most of these engines in stock form would be considered ported compared to our saws. I typically run 40 to 1 in mine. Now our saws for all purposes are low performance, but high load. The 50 to 1 is a pure emissions thing. There is factory documentation that most saws over 60cc (from husqvarna) should be in the 33 to 1 range. My 2 go to saws for years have been a 562xp (60cc) and my 390xp (88cc) so to avoid confusion I run them all on 40 to 1. I have yet to have issues with engine longevity, or seized any engines. Now if we want to look at my old mc cinder blocks even the pm605 suggests a 16 to 1 oil ratio on a straight 30wt engine oil. This was true for the 10-10 as well. They suggested a lighter ratio with a specified mcculloch 2 stroke oil mix. They both live (lived in the case of the 10-10, I don't own it anymore) happy lives on 40 to 1 oil mix.
Really the ratio can be determined on 2 factors alone, expected load and top rpm. 2 strokes are a wasted lubrication system. It cones in with the fuel and is burned during combustion and or expelled with the exhaust. So the faster we spin an engine the less time it has to stay (oil) in the engine to do its job. Oil saws spin pretty slow in the greater scheme of things. Then we have expected load. Our saws spend most of their time pulling a chain through wood, doing a hard job in sub optimal conditions. So they have a high load. So there for we need more oil to keep things lubricated properly. This mainly is for piston wear as the bearings can live a pretty happy life with minimal oil. (So long as they don't get excessively hot)
Once you factor in modern synthetic oils, and additive packages you fund you don't really need as much oil as you think. Really some where between 33 and 40 to 1 is sufficient for most of our saws. (Larger displacement, milling etc). Now when we look at the broad range of power equipment and their tasks, factor in epa requirements you quickly come to realize that homenowner use far out weighs that market and the higher oil ratios for moderately powered engines isn't needed. Thus you have the std 50 to 1 ratio. It's fine, just ideal in many cases. Larger displacement and higher loads just need a but of extra cushion.
Really when you get down to it it can't really hurt the equipment at any rate, so long as the carb is (can be) tuned for the higher amount of oil running through the engine.