[paulddraper]

Yes. AWS Route 53 can do this for root or non-root records. They call these "ALIAS" records.

[pluc]

Those only work for AWS services though, CloudFlare CNAME flattening works with any endpoint by providing some sort of HTTP proxy

[twothamendment]

I wish there was a standard way to do the same thing. Route 53 is nice when I can use it, but it causes me pain on a regular basis because not all the domains I deal with are on Route 53.