I disagree; it's very important to talk about complexity. Otherwise, we can't minimize it, and however you define it, it is a problem in software.

You're right, though, the definition is sprawling, so I think it makes sense to use smaller more precise words. The good news is we have some of these: Referential transparency, pure functions, immutability, and neologisms such as "complection". These are very useful, meaningful terms.