I don't think it's meant to be a point against abstraction or a point against complexity. I think it's widely understood that abstraction is part of how advancement is made in our practice, as well as in other disciplines. I have taken this saying to be an observation that there is almost always possible failure beneath the façade provided by the abstraction. Therefore, yes, you avoid having to let that complexity enter your brain, but only when the abstraction is holding. Beyond that point, often after pages are sent, you will still have to engage with the underlying complexity. A proactive measure following from this idea would be to provide support in or alongside your abstractions for situations where one must look under the bonnet.