Why is it bad to use a function without parentheses in production? [closed]

Question

Reading through Invoking a function without parentheses it is stated multiple times in the comments and answers to not use such code in production. Why please?

I am a beginner at JavaScript as you can guess from the question. If someone could phrase their answer in layman's terms that would be great, though please also counter for the experienced JS folks among you that might need a more detailed and technically detailed reply.

Examples of what could or does go wrong with using functions without parentheses in production would be a great addition to an answer.

Here is example code of invoking functions without parentheses taken from the answers to that question.

var h = {
  get ello () {
    alert("World");
  }
}

Run this script just with:

h.ello  // Fires up alert "world"

or

var h = {
  set ello (what) {
    alert("Hello " + what);
  }
}

h.ello = "world" // Fires up alert "Hello world"

Answer 1

It doesn't really matter whether it's in production or not.

It's because it doesn't look like a function call and that's confusing for other developers.

Imagine how difficult it might be to track down some complex behaviour in a large application when any property access and assignment could be calling out to some arbitrary code.

Although there are valid uses for getters, setters and eventually proxies, they are suited to very specific behaviours in small surface APIs. They probably shouldn't ever be used as a general programming technique.