User blog comment:Keekian/The topic of Haki./@comment-24850639-20171229162127/@comment-181.169.59.33-20171230111520

You got a point, but at the same time you're missing something else. Both can be used for defense, and since it doesn't rely on physical strength, I think it would be helpful for them.

We've seen Nami making plans and strategies, and that's mostly how she fights, so... knowing the enemy's hiding place would be great for her. And since she doesn't have much physical strength to rely on when it comes to defense, knowing where the attack is going to hit and using armor to block isn't a bad idea. Her Haki won't be as strong as what we are used to, but it can help.

Regarding Usopp, it's basically the same. He uses Observation to snipe. Armament can be useful for him as well. What if someone is in danger, or about to be caught off guard by a Logia? Usopp's skills would be the best choice rather than someone running and trying to make it in time.

Haki is always useful.

For example; Robin needs to "see" the place she wants to use her powers on. I don't know if it works, but maybe she can use Haki to see it.

Maybe Chopper can use Haki to improve his overall abilities. Using Observation to improve his Brain Point. Using Armament to improve his Guard Point and his Horn Point.