Yeah, I'm seeing something of a fallacy in these comments that writing something once necessarily means it's written badly and will break/page people/etc. Sometimes you gotta get a lot of stuff done that has low complexity (e.g. in a startup) and writing it twice really is a waste of time.

A few basic sanity checks (some unit tests, a little discipline avoiding the abstraction high, whatever your flavour may be) is fine in many scenarios. Not all features require tons of monitoring and documentation. Everything in our line of work is a trade-off!