Agreed, while chaining can look very pretty, it's a pain to re-parse and a pain to modify.

It's the same reason I don't like this style of function:

    .map(var => var.toUpperCase())

Sure, it's great today but but I want to debug it I need to add `{}` in and/or if I need to add a second operations I need to add the curly braces as well. That's I prefer explicit:

    .map((var) => {
        return var.toUpperCase();
    })

Since it's much easier to drop in a debug line or similar without re-writing surrounding code. It also makes the git diff nicer in the future when you decided to do another operation within the `.map()` call.

I've asked many people to re-write perfectly functioning code for this same reason. "Yes, I know you can do it all in 1 line but let's create variables for each step so the code is self-documenting".