But those metrics are important, if servers serve more optimized pages to Edge users for some reason that a freaking important fact to know.
This is about real world data and real experiences and how it affects actual real users.
You can normalize the tests to the point where there is absolutely zero difference between the browsers, of that I'm sure, but that will not reflect any actual cases that real users experience.
Within those specifications, the objection about the ad-block become irrelevant. If the browser justs works better, then users don't care and can simply enjoy more battery time.
The case for more normalized tests is to find out which browser is factually better designed/written.