TBN & WD probably wont be fundamentally changed (in 6.xx)

[Imoye]

So many Why's about Dark Knight atm.

DRK is a hackjob and got absolutely zero love in Endwalker. The devs spent 5 minutes tops on rolling a dice when deciding what to keep and what to remove. There is no coherent design philosophy behind current DRK. Large parts of the kit make zero sense both thematically and functionally.

If you're looking for a reason, you won't find any. Reason implies some sense of logic behind the design choices, but to me it's pretty clear they rolled a dice, slapped something together. and gave themselves a pat on the back.