I used to work for AWS on a service team. I noticed we were spending way too much on provisioned concurrency for dynamo and would benefit from on-demand provisioning. After proving it worked, making the change, deploying, was rather pleased with myself. "Saved $2M in costs by switching to on-demand provisioning" barely made it onto my performance review lol.
They might just not have believed it. At the management level everyone is busy claiming to be delivering huge numbers all the time, and people stop trusting that sort of claim.