As I see it, meditating with no goal does not mean
meditating with no goal.
It simply means that when you actually sit down to meditate, you aren't preoccupied with some other thing besides the meditation or meditation object itself, which takes your attention off of the actual meditation you are doing right now. It does not mean there is no reason to meditate to begin with.
Seems to me that "Don't meditate with a goal" is instruction usually given to people who say things like "I did not have any good meditation today! I was just distracted the whole time and didn't feel what I was expecting to feel! My mind did not become quiet like I was expecting it to become! My thinking did not stop like it was supposed to! What happened?! What did I do wrong! etc, etc." And Of course brooding like that only serves to give you even more distractions. So people say "Don't meditate with a goal" for the purpose of helping people stop the unnecessary and counterproductive brooding over what did or did not happen over that 1/2 hour you were sitting on that cushion this morning. It's not talking about the "big picture" reasons to meditate, which of course is to gain insight leading to enlightenment and end suffering, etc.