For me it's good to know the inner details of the tool I'm using.
And when I compile executable I know purpose of every byte in it. That's not possible with other languages like GO, that gives you 2MB hello world executable
It's not good to know if you never end up actually using the tool though
Yes, if you don't use tool then it doesn't matter.
With FORTH every WORD is a little program that you use like million of times if it's any good.