And swords can be harder without Haki than those with, thats jusz your Interpretation of it.
What you seem to be saying is that a black blade isn’t actually a big deal, which is very contrary to how it’s been presented thus far. The only two we know of have been owned by the WSS. I
If the only thing Enma was doing is making Zoro force to give out his Haki without doing more than other swords with it, there would be no reason to use it, since other swords will so the exact same thing.
Too philosophical, we are talking about specified applications. Of course control is always better, control is not always stronger.