If they were smart, they would've united Delirium with Inner Shadow in such a way that you're granted some MP back like the old way and then either extend it's duration or have delirium apply the last few set of skills you used prior to using Living Shadow. There should be some form of connection to the skill but there sadly isn't.

Unrelated and personal preference... I wish it wasn't Fray anymore to a degree. I wish it was our level 50 self, our true darkside... us in DRK artifact gear blackened out. Seeing multiple DRK's with also Fray up is a bit immersion breaking... Just saying.