Please no. Whips are a silly "weapon" and would be ineffective against nearly everything.
Walking around in full plate all day every day is silly too for so many reasons and would quite frankly probably kill you in hot weather. So are giant maces and double-bladed axes etc.
I think that whip-blades/ chain-swords would be cooler tho like Ivy in Soul Calibur and in Castlevania, and they were a real thing ( sorta ) historically too.
People can argue about the use of it against armor but then again our characters are cutting through armor with swords... Even if you thrust as hard as you could into armor you wouldn't pierce it much and definitely wouldn't reach flesh except for some areas that wouldn't be lethal.
