(Ninja) Why is Hurajin and Thing?

[Shurrikhan]

The point of the ability is so that you don't have to waste a mudra on reapplying Huton when you die.

That's it. I think it's good, because ninja was punished more so for dying than other melees.

Have you seen what happens to Eyes or Beast Chakra on death?

But yes, it doesn't reduce the skill ceiling in any way; it just conveniences the floor slightly and reduces the penalty of dying somewhat.