Tradition DRK?
First DRK appeared in FFII. Serve the emperor after join force with the empire.
HW DRK is closer to the original in term of trying to be Darth, Sith. Ever wonder why Hard Slash and Syphon Strike have a weird sound effect that sound like a lightsaber and why you have red and blue slash? Why you debut in Ishgard with Darksides? Why Darksides used to have risk/reward?
Flood of Darkness/Shadow is also not something new :
https://youtu.be/eT52NwstF5E?t=91.
The thing that is out of place, a problem that deserved to be removed from DRK isn't life drain but rather the counter mechanic that HW DRK player loved.
I'm still haven't seen any explanation why Barrier is better than Life Drain for DRK. If you just ask for a change without a proper plan, didn't show the dev exactly what you want- how it supposed to work-how the mechanic look like, you're risking to met with the same problem that the GNB players are facing right now. Despite having a sound effect adjusted twice it only grew worse because the dev didn't receive a clear message. At least make some calculation. Show some concrete plan.