Using auto scaling groups to manage ec2 instances

We are in the middle of converting a single enterprise database into a 3 node casual cluster and the current thought is to use an auto scaling group to manage the ec2 instances. After looking around I haven't seen this mentioned before and wondering why (or if I'm blind)? The templates don't use an autoscaling group and this article from a few years ago does mention the possibility of an auto scaling group, but it's referring to a HA cluster so I'm not sure if that's still relevant.

I'd be very interested in knowing more as well. Especially, how do you deal with synchronisation of things like GraphQL schemas when every instance is using a native Neo4j GraphQL plugin installed in the AMI itself.