I think it has been mentioned a few times already but ARM64 on servers is also quite compelling (Graviton on AWS and Ampere Altra in Azure). I've actually seen a few customers that couple the move to new M1 MacBooks for their devs with a move to ARM in production as well to retain that same "the same container image runs on both" that they were used to even if they go multi-arch just incase.

In one case the devs were given the condition of getting their containers working on ARM to get the new MacBooks they wanted - and the cost savings of moving to ARM in cloud even subsidised the cost of them a bit too...