[nijave]

In my experience, It Depends

For big flagship services you can usually get pretty good support (EC2, S3, SQS, Lambda)

For smaller/more niche services where AWS stood up a managed version of some OSS it's more hit and miss (like managed RabbitMQ).

In both cases, it definitely helps to have an open line to your TAM and send them case numbers and they'll usually do some internal nudging to keep things moving. In addition, for projects, you can usually reach out ahead of time and get some dedicated SMEs to help set things up/train you.

In either case, hopefully you've never had the displeasure of working with Azure support.