It makes the build so much more fun to play. It’s actually hard to touch a non-seasonal barb after seeing how much more fun the build could be.
I feel like adding it to the Bul-Kathos blades set bonus would be the easiest/best way to go. It fits the set thematically would give that set some much needed love – while enabling multiple whirlwind/rend barb play-styles moving forward (BK being the fast/auto drag solution, while istvans/captains retains the damage/toughness edge but requires more micro managing)