Well, part 3 at least explains something I've observed; the platform is incredibly unstable. The same calls, with the same parameters, will often randomly fail with HTTP 400 errors, only to succeed later(hopefully without involving support). That made provisioning with terraform a nightmare.

I won't even dive too much into all the braindead decisions. Mixing SKUs often isn't allowed if some components are 'premium' and others are not, and not everything is compatible with all instances. In AWS, if I have any EBS volume I can attach it to any instance, even if it is not optimal. There's no faffing about "premium SKUs". You won't lose internet connectivity because you attached a private load balancer to an instance. Etc...

At my company, I've told folks that are trying to estimate projects on Azure to take whatever time they spent on AWS or GCP and multiply by 5, and that's the Azure estimate. A POC may take a similar amount of time as any other cloud, but not all of the Azure footguns will show themselves until you scale up.