I agree with the rest of your comparisons but I think this one is suspect:
Compare the salaries of ETG EAs with non-ETG EAs that are otherwise as similar as possible, e.g. a quant researcher at Jane Street vs one at Redwood Research. Usually, I think the ETG EAs earn more.
“Pure” ETG positions are optimized for earning potential, so we should expect them to be systematically more highly paid than other options.
I agree with the rest of your comparisons but I think this one is suspect:
“Pure” ETG positions are optimized for earning potential, so we should expect them to be systematically more highly paid than other options.