You're replacing 1 "spam this 1 button until you can't anymore" with another version, and this version you suggested is basically spamming 1 button like you were a caster DPS with the changes you proposed, which Dark Knight mains might as well be playing Black Mage at that point since all Black Mages they do is spam Fire IV until they can't anymore, and people who play tank expect to play like a melee DPS with multiple interesting gameplay gimmicks to make them not be a blue DPS, not to say that the change suggested is bad, but comes off as just replacing the Bloodspiller spam with Edge of Shadow spam...


And it doesn't really address that you're still spamming Souleater combo while waiting for other cooldowns to be ready, like many other DRK change suggestion threads...


As for removing Darkside, just make it a separate button so that the devs don't get the "bright idea" to lock Blood Weapon activation behind Edge/Flood of Darkness/Shadow like they did with Darkside...