Some points I agree with, some I don't. As mentioned, you don't know that every E10 is 95RON (Mobil/7Eleven list them as 94), so treat them as 91RON ("up to 10% Ethanol"). I wouldn't risk running an engine that's designed to run on 96RON on anything less than 96RON, but hey, your money and car. I sure as hell won't be buying your vehicles off you if you consistently run E10 in a standard Skyline.
But like a lot of people, saving money is the key here. So choice is a good thing really. In NSW the government tried to get rid of 91RON and then later changed their minds. I don't run E10 on any cars I fill up. Either put up with putting 98RON or sell your car and buy a little commuter car designed to take E10 so you can save even more money! Or you can fill up on cheap days where the price of 98RON drops 10-20c (it's usually 15-20c more expensive than E10).