The problem is that user(_at_)ai is not globally unique.
MIT users will have problems talk to user(_at_)ai when "ai" means
Anguilla. The is a current security issue.
If / when MIT stop using ai.mit.edu, "user(_at_)ai" will not longer
mean user(_at_)ai(_dot_)mit(_dot_)edu(_dot_) This will mean that any
configuration file
that has "user(_at_)ai" will now, suddenly, get a different meaning.
This is a latent security issue.
If by "latent" you mean "so obscure that in the ten years that there's
been A and MX records at TLDs nobody's been affected" I guess I agree.
R's,
John
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