Implying that execution complexity is increased? Is a function not dynaically bound at the last moment anyway, regardless of how it is called? Where is the increased complexity?

Yes. Every time you introduce a new library, the deterministic nature of a system is challenged. It's kind of a silly point, though - the browser itself introduces more execution complexity than any JavaScript library could.

Oh, I see what you mean now. I was referring to those libraries as an example of a useful application of the pattern. My point was, if you disallow passing functions, you disallow those patterns.