at this level they just decide and spin up a swat team to execute it in a couple weeks without politicking. the bureaucratic ways, reviews are just for the low levels, to keep them busy with feature scraps while they mostly do operations
secondarily its an industrialization of software development. the hiring process is where they try define the labor as a replaceable component. grab the best cogs you can annually for the lowest price, run them in the machine for 2-4 years and swap most of them out before they get too expensive, or specialized or uppity.
...anyone with a brain at AWS knows that supporting OpenAI's latest models on Bedrock is simply good for AWS. That context is rather important!
Why would I care if AWS asks their engineers to work a little harder on a project
There's always some carrot with the stick, even if an imaginary one!