[_delirium]

I agree, Postel's principle makes a lot of sense in context, if you view it as a bunch of mostly good-faith people attempting to bootstrap communication in a new medium. Then it's clear that to get things working, you want to forgive errors on the receiving side (to the extent you can do so), but send as clean and unproblematic output as you can. Basically what a sensible, not-anally-bureaucratic human who's trying to establish communication would do. It was also, iirc, influenced by some of the difficulties ARPANET had experienced in getting different implementations to interoperate. But it may make less sense today.

[ams6110]

Agreed. Today, I think "fail fast" is a much better principle.