I'm not plugged into EC2 nearly enough to know the exact reason why #3 isn't a thing. But IAM has been around for a long time and is showing its age AWS continu

I'm not plugged into EC2 nearly enough to know the exact reason why #3 isn't a thing. But IAM has been around for a long time and is showing its age AWS continues to push out new services. A lot of rough edges around services boil down to 'we use IAM as a dependency, and IAM is a giant bottleneck.' I wouldn't be surprised if having multiple instance profiles on a machine is one of those things that is bottlenecked by IAM. Allowing multiple roles on a single EC2 machine would put a lot of additional strain on IAM's backend.