There's a difference between "don't always" and "unreasonable." It seems like if you can get a phone that performs as well as something that costs 2x as much, and the compromise is gaming near an outlet, or carrying an external battery, that's a choice some people would like to have.

And if it is the battery that's "unreasonable', then I wonder why the review sites don't just factor the cheating into their review by having a category like "battery life running PCMark" or something where they measure how long the phone will run the benchmark.

Customers are not informed, they just use the number - if you game the number you are unethical even if you pretend like its for consumer choice and enhanced information - no matter what that's not how consumers use it and you are juicing a number to get additional sales.