io2 = very high performance
io2 Block Express = extreme performance (but with instance + size limitations).
It is a modern EC2 instance types that use the AWS Nitro System.
Delete on Termination only applies to the EC2 instance that created the volume attachment. If multiple EC2 instances are attached to the same volume (via Multi-Attach), deleting one instance does not delete the volume unless delete on termination is true.
Yes, Provisioned IOPS EBS volumes have some region-specific restrictions and limits.
Yes, we can modify an EBS volume that is enabled for Multi-Attach, but with certain considerations