Case in point - I was fixing an issue today, so had iam/s3/ec2 open. They have different favicons. I had the situation we all know where I had 40 different tabs open whilst trying to work out what was going on, thought I didn't have an AWS tab so opened another one purely because the iam favicon is completely different to the rest.
I know it sounds silly, but it is indicative of the entire thing - their ECR doesn't support going back in the browser for one. I'd run to GCloud, but unfortunately the company i'm contracting at won't move.
I can easily imagine this being a deliberate decision to make it easier for someone who uses AWS a lot to click the right tab when they have 40 tabs open.
I agree with the point that GCP feels like it has better docs and API than AWS.
AWS premium support doesn't help much when you are fighting fire because the first line support staff is clueless. It will take you days to reach a person who can actually help you.
IMHO, if you are offering a standalone product, you can always do better than Amazon (AWS). Whether you can beat them depends on variables other than the quality of your product.