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I've noticed this in a bunch of places, weebly, tumbler, heroku: Why aren't this done using CNAMEs for exactly this reason? Also, it'd give them more freedom over their infrastructure, would be able to separate it on different datacenters etc.

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Ah, the answer is in the comments. A root-domain can't be CNAME, so to avoid confusion they just tell people to use A.

My DNS provider has a web-forward service, though, so I can translate domain.tld to www.domain.tld before even hitting my server.

They should be providing both as an option. There are a lot of people who use sub-domains, and in that case a CNAME is a better option.

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