That’s quite a take.
Mrwhostheboss tested the phones under ideal circumstances. Exact same settings, exact same brightness calibrated with a meter, and all fresh batteries.
Yes, different people use their phones differently, but the test is actually a precise way to know what is the real battery capability of these phones.
I'd never heard of Mrwhostheboss until this week, so I don't know what his normal use cases are, but as far as I can tell his benchmarks and battery life tests for the Air don't match what any other reviewers are showing, and they absolutely don't match what I am seeing with my personal Air.
I suspect he is doing a "pro-focused" set of tests, which of course will make the Air look worse compared to the Pros. That is super helpful for people with pro use cases who are interested in the Air, but not really helpful for most, because I assume people who care about things like recording in 4K, running LLMs on device, and shooting RAW already realize the Air isn't for them. So running those sorts of tests on the Air kinda miss the point, as far as I am concerned. (Although I understand why a video showing "iPhone Air Battery Life and Performance are Terrible" might get a lot of clicks and therefore Mrwhostheboss might be inclined to do something like that).
To use an analogy, if you're testing cars with a heavy trailer attached to the car/truck, then of course the Ford Focus is going to do worse than the F-150. But I'd argue that isn't actually a useful test because 99% of people who need to attach a trailer to their car aren't even going to look at a Ford Focus.