I never interviewed for the AWS side of the house since I knew I wanted free time, and a life.
It's the bar raiser's job to make sure that the hiring manager doesn't just hire people to fill seats. More than once, I've seen bar raisers override hiring managers when there was compelling evidence from the technical interviewers.
At least in my org, you don't get the job if you don't raise the bar. Period.
I had plenty of times where an entire hiring pod would incline on a candidate because they had the soft skills we were looking for in that role and we knew we could sharpen their technical skillset in house. You don't have to be a rocket scientist to work at a FAANG... you just have to be interviewed by a team that is hungry and likes you.
You're evaluated against people in the same role, not the entire team. But, yeah, the idea is that the hiring standard (the 'bar' in Amazon terms) is always getting higher.
I am not looking externally until I'm sure I'm done at AWS. I've done 80+ interviews here, and I'm consistently amazed by what drives people to say "The candidate wasn't up to the coding bar". As far as I can tell, you are almost never up to the coding bar. I think we interview so many people just to remind ourselves that if we leave, we aren't getting back in.
Just to head off the "So why don't I argue for change?" questions, I'd rather work on self improvement than fight tooth and nail to make the hiring process a little bit better. I'll let somebody else add that to their promo doc.