Happy B day!
In the beginning, 4 strokes were for the old guys who wanted to putt around with a big trainer; now they are high performance engines. Saito wants higher oil because most users are dumping a bunch of nitro in the engine to get the most power for the least amount of weight. What you are up against is the technology of the product vs. what everybody does; and although I like the technology do I try to prove it all the time? No, I buy regular 10% sport fuel and all my engines get it except one YS, so I play it safe and follow the leader. And for the people with the money for a new YS 170 ignition engine they are trying to drop the oil content of the fuel for more performance, as once the oil gets to the combustion chamber it becomes a "contaminant" because it does not add power and displaces the nitro/methanol that could be there to burn in its place.