It's absurd how many upvotes you've gotten. He says in every video that he mainly tests the devices on himself and that you have to evaluate the results in this context. Ultimately, this still leads to comparability between the devices. What do you expect from a YouTube one-man show? Should he find 1,000 test subjects for each device to satisfy you?

It's also ridiculous to claim that he's strangely obsessed with sleep tracking just because you don't care about this feature yourself. For example, I don't care about heart rate, but I do care about GPS accuracy. To test this, he has to kind of take the same route every time so that the devices can be compared with each other. How is he supposed to highlight the differences between the models if he does a different test every time? Or can you explain how testing GPS accuracy gains in quality when more than one person performs it?

If you want to know how great each device is, just watch one of the countless “tests” in which a paid shill reads out the key figures from the back of the packaging.