I think it has to do more with familiarity than complexity. You could have a good understanding of features like the ones showcased in the blogpost, but it could take you a minute of staring at a line to parse it if someone uses it in a way you're unfamiliar with. Doing that for potentially hours on end would be a pain.

It's definitely something I'd write for fun/personal projects but can't imagine working with other people in. On a side note, I believe this is where go's philosophy of having a dead simple single way of doing things is effective for working with large teams.