Totally get that, I argued with friends of mine that have a vast knowledge of Lore both Old World and 40k, and one of them said that he wished Fatshark would have stayed in Woodelf Unitroster for additional Elf Careers.
On Kruber we never found an additional Empire-Career that made sense so we accepted GrailKnight as a kind of “well we need a 4th career and people asked for a Bretonnian anyway” kind of thing.
But we came to the conclusion, that Bardin and Saltz (if he gets Warrior Priest of Sigmar as 4. career) got the most consistend careers lore wise. Whereas Kruber only sticks out with Grail Knight.
Sienna was weird with Unchained but Elf is mostly all over the place xD
For the Sisters of Battle, would be fun to get a (bigger) DLC/Add-On with an extra playmode (like weave just not as shitty) and then you can play a Gun-Nun-Kill-Team xD Careers like: Melee-focused, Flamer, Ranged-focues and whatever else would also be fun. But well we will see.