Nope, the projectile attack didnt even depend on the sword, so no matter the motion (whether it's a slash or pierce, it's not even related to Shanks being a swordsman. You saying Zoro having ranged attack doesn't change anything about Shanks not depending on his sword for his strongest attack to the demon, or not depending on his sword to cancel Greenbull's DF.
So Roger or Xebec being a swordsman doesn't mean that Mihawk or EoS Zoro will be stronger than them, since it will mean you dismiss the narrative of Luffy surpassing them instead of Zoro, dismiss that haki can do its own attack just like DF, or dismiss the current powerscaling.