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some DNS services are providing "ANAME" http://www.dnsmadeeasy.com/services/anamerecords/ for instance

Exactly! It's a little questionable that the linked website doesn't mention the existence of these types of records considering how widespread they are these days. Every DNS host I've used in the last five years has supported something like "ANAME". For example:

* CloudFlare's "CNAME Flattening": https://blog.cloudflare.com/introducing-cname-flattening-rfc...

* DNSimple's ALIAS record: https://support.dnsimple.com/articles/alias-record/

* Route 53's alias records: http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/res... (although these need to go to an ELB, CloudFront distribution, S3 bucket, or Elastic Beanstalk environment)

Those are non-standard proprietary extensions that aren't universally available. Omitting them is not questionable.

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