If Mihawk is so strong and every sword user is a swordsman then why Mihawk never beaten Bigmom or Fujitora etc... It is a titşe based on skill.
That's not true
Only a Baboon would think that way, I always see the same orangutans on this website hating on mihawk religiously.
Obviously you need inhumane strength to do what Mihawk does, like Wielding Yoru the way he does. The sword doesn't make the man, that's why a swordsman has to forge his own black blade himself.
And if you take vivre cards, Vista's swordsmanship is said to be on par with Mihawks, but only Mihawk is called the WSS, so there is a clear distinction in strength. Hence why he's the strongest and not Vista.