Well what's funny is I asked about Path C that has +15% WSD, but people have only made Path B cause that was the niche I guess? idk
I made Father Time path C around the time when Dyna Wave 3 was still new. It's still BiS for Drain Potency (but yes, there are free alternatives like Dacnomania, and Misanthropy, each of which provide Drain Potency+20 vs Father Time's +25). My rationale at the time was a few reasons combined. It enabled me to full-time Father Time in Dynamis-Divergence, while also doing Drain 3 at will, for Max HP boosts while not having to worry about TP loss. (I doubt you'd full-time Dacnomania, or Misanthropy, but I guess you certainly could).
Obviously, the WSD+15% was a boon, before Nyame existed and especially so when PDL traits and gear became available. The +3% attack bonus is ~120 attack at 4000 HP, and if you're able to get 9999 HP from Drain 3 (which lasts 3 minutes) your attack boost is now about +300 attack. If the pDIF ratio or enemy defense rating is in your favor, the WSD+15% and +300 Attack Buff probably puts you in a better position to take advantage of PDL gear and Aria of Passion.
However, unfortunately, I have not been able to test it more recently as my primary DPS weapon. It's probably worth testing again since I got Nyame R30 a while ago, and we do have some additional sources of PDL (Prime Horn, Ephramad, DRK AF+3, etc).
Perhaps a more frequent Dark-Knight-Enjoyer has already done these tests or has recorded some anecdotal observations?