Minnie and Zoya are among the few tanks where accuracy and piercing emblems are almost necessary for them to function well. They also fill pretty similar roles, so I can see replacing Minnie with higher regular damage and AoE Zoya.
Still, that active is great and Minnie's not too costly to deploy. I have a piercing emblem with a high flat damage boost that's about perfect for turning Minnie into a shredder. It'd be cool if you got an after action report to see how much raw/actual damage your tanks put out/soaked up during a fight.