[baby]

Sometimes (often?) an outdated document is still great and useful and much better than no documentation at all

[zeroonetwothree]

Equally often it’s worse and a waste of time. And you won’t know which world you’re living in for a while.

[baby]

I've yet to find an outdated doc that makes the situation worse (unless you assume it's correct and up-to-date, which you should never do with anything anyway). There's a reason we like RFCs even if they only represent a decision in time.