we can read this
but we are not going to do because it's a mess

Doesn't matter which way you do it you still get the same result. It's the same with addition too.

If you have problems reading this, you need more practice reading code; this is on the "minor" side of unreadable.

Not to my knowledge.

Function name is just a variable pointing to callable object, same as other variables are pointing to other value types. So you can treat them same.