[jng]

They usually end up upgrading most instance types to new graviton generations, it just takes time to do the full rollout.

[MrDOS]

Not really: burstable (“t”) instances haven't been updated in years. The current generation (“t4g”) still use Graviton2 processors. I get the impression that they would vastly prefer cost-conscious users to use spot instances.

[everfrustrated]

the -flex suffix variants seem to be the new spiritual successor to the t burstable class.

eg c7i-flex.large, etc.