"Working as intended"
To clarify, when the game was originally released the SLDF Black Knight was only available to the player for all of one mission, and this was intentional to ensure the BK had the proper heat capacity at the time. Afterwards, when they were released into the wild as rewards/store items, the black knight kept its extra DHS because in its config it really still needed them, and the base sinking capacity was only 30. Now though they get the extra heat sinks, and base sinking capacity of 60, which, is probably overboard, but most likely not going to be changed now.