It's definitely nice to see caster's getting some attention. Slith is probably being left alone because he's in a good spot overall and Mortanica requires more development for her to be more coherent.
I'm excited for new augments and the new UI for them. However, I am dreading the grind as it gets really hard to collect the materials you're looking for.
Proficiency capstones are always nice. I think once there's a price difference between them it will be a bit more balanced. Until that happens though, its likely that builds will suffer the same fate.