Please help me understand the Enlarged Heat Sinks?

Mark I and Mark II are both less effective both in heat capacity and total cooling than a standard single heat sink from the base game.. Regular heat sinks are 2 capacity and 0.2 cooling for 1 slot and 1 ton. Mk I Enlarged is 0.7 capacity and 0.07 cooling for half a ton and 2 slots (less than half the effectiveness of half a heatsink..) and finally Mk. II Enlarged is 1.8 capacity, 0.18 cooling, for 1 ton and 4 slots... still less than 2 and 0.2!! What is the point of these? Are they just poorly conceived items?? The only one that's actually better than a normal heatsink in *any* way is the Mk. III and that needs SIX SLOTS in order to only have 0.2 more capacity and 0.02 more cooling!

Am I missing something here or are these just largely insane and pointless as they are?