Cloud Mercato tested CPU performance using a range of encryption speed tests:
Cloud Mercato's tested the I/O performance of this instance using a 100GB General Purpose SSD. Below are the results:
I/O rate testing is conducted with local and block storages attached to the instance. Cloud Mercato uses the well-known open-source tool FIO. To express IOPS the following parametersare used: 4K block, random access, no filesystem (except for write access with root volume and avoidance of cache and buffer.
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As you are aware, as of May 2024, there are no m7i series instance types with NVMe-based volumes.

I understand your explanation, but the reason why AWS took the decision is not clear, as the equivalent ARM instance type, m7g, has m7gd instance types, so is not only a matter of "consistency across different instance types"

m7i instances in AWS don't have built-in storage like previous types. Instead, they use EBS volumes for storage. AWS likely chose this because EBS is more flexible, reliable, and consistent across different instance types. It also allows for better cost management.

as of May 2024, there are no m7i series instance types with NVMe-based volumes.

I'm migrating from previous instance type m6id to m7i and I cannot migrate using the same storage configuration as m7i instance type has no Instance Storage