Should Dark Knight get a Rework?

[Midareyukki]

And this may be controversial, but why can't Dark Mind and Oblation just be a lesser damage absorption barrier version of TBN? Dark Mind just feels like an old outdated relic from HW and Oblation just feels like our old Rampart clone mitigation ability from that same timeline. Since DRK is so focused on using the TBN, why not just go all in and make its two mitigation moves lesser barrier abilities, too?

So basically a shield tank?