Correct. If it lasted 90 minutes they would clearly attribute it to playing the game. If however a regular mix of typical daily activities gets low battery life, that's just the phone's fault.
But I would add that Apple has done a lot of work to make their game APIs power efficient. Metal is a perfect example of a more proprietary approach that achieved significant speed and battery life gains.
I'm looking at you Pokémon GO.
But the other thing is it's obvious when I play a game. Where is I don't really think about using Safari, but I'm sure I use it dozens and dozens of times a day. So I'm very conscious of the fact that Pokémon go or whatever else I'm playing eats my battery, but all the little interactions with the web browser eating an extra 20% probably wouldn't raise a flag for me; I'd just think my phone's battery life got a lot worse.
That's my best guess anyway
The other commenters are right. If people bought an iPhone, downloaded Chrome (the REAL Chrome), and use their phone and got six hours of battery life who do you think will get blamed? Apple.
People here all sorts of stories about how Apple doesn't have good battery life in the use chrome on their computer and it doesn't cause their computer to have five hours of battery life (even though Chrome is a known battery hog) so it must be Apple's fault. Blame the $900 phone.
For battery reasons alone I completely understand Apple's decision. There are plenty of other issues, such as keeping things updated with the latest iOS API is that are needed by the default browser, although some of that could be worked around with large third parties like Google.
I know they were missing features the people are absolutely clamoring for here on HN, but every time I asked they never seem to be something that I care about. I don't really care about web RTC, I don't remember the last time I wanted to have a webpage record audio, the fact that local storage doesn't persist across private browsing tabs is a FEATURE to me.
I think this fits well with the other article that's currently on the front page. Lots of people here in another text sites trounced Apple for their computer updates this year, but normal users seem to be very happy with them. A lot of these positions seem to just be too far out of Main Street (and there are so many iPhone sold that mainstream is GIGANTIC).