Think ALB already supported only SNI. Cloudfront has an offering that supports the older standard, but that's really expensive because of the need for all the static IPs.

Think the load balancers never had the possibility of static IPs, so SNI from the start.

But yeah, like another comment said, with the built in ACM managing certs is a non issue. It's like having an AWS specific Lets Encrypt for any service you want.