> It's like every service was designed by a totally different team.
Yes, by design.
Conceptually this improves velocity and reduces the blast radius of failure.
In practice, everything depends on IAM, S3, VPC, and EC2 directly or indirectly, so this doesn't help anywhere near as much as one would think.
Azure and GCP have a split control plane where there's a global register of resources, but the back-end implementations are split by team.
That way the users don't see Conway's Law manifest in the browser urls... as much. (You still do if you pay attention! In Azure the "provider type" is in the path instead of the host name.)
