The problem with those headlines on HN is that they mean to be boastful, not humble.

I totally get the point of the headlines, if they meant "... so disregard minor bugs we have left to iron out".

There's not much of a point in boasting about creating a service/script in X hours or weeks, unless you're applying for a very specific job or trying to explain how easy it is to set up a Y (e.g. PAAS, frameworks, etc.).