Well, the plan could be to have large numbers of MBT in the garage to threaten Russia.
To operate such a fleet you need MBTs, IFVs, ARVs, AEVs and AVBLs and other support vehicles.
So far I don't see that for any type of the Polish MBT in a significant way so it doesn't matter if there comes a third type ;-).
Or lets say there are some open challenges.