I asked about this awhile back and Mikey Ds reply was they were against slat armor being added to the Ukr vehicles because of the amount of tandem warhead at weapons in-game would make it pointless. I kinda agree...
It makes sense with the amount of PG7VRs in the Russian inf squads but with uncons added there would be a situation where slat would be worthwhile. See with uncons and their mix of kit you would see much more single stage rpgs in their hands like PG7VL VM V and just a few VR here and there depending on equipment quality.
The added workload might be a pita for Bfc so i would be suprised if they change their opinion in the future.