I've watched someone spend days learning to configure a performant DB server on AWS due to their poor disk IO performance and spend an enormous amount to get a high ram instance when a simple SSD based server where more IOPS were trivially available would have had it working out of the box.
Everything has a learning cost though, so perhaps that's a somewhat unfair example as having a deep knowledge of data centers and backbone providers doesn't come free, but I can crank an ansible and docker script out and have pretty much all the advantages of AWS but deployed on my own hardware at a fraction of the cost. So I'm not sure it's fair to say that AWS tooling offers anything particularly unique to merits its market position.