I hesitate to start this topic, because I fear pointing this out could result in a nerf instead of a buff… but here we go anyway.
Data:
3xHB1, 3xHB2 = 300 PIO / 300 SET; 66 Area
4xHBB = 300 PIO / 300 SET; 60 Area
HBB = 10% area savings for some additional building costs
3xHB2, 3xHB3 = 300 SET / 300 TECH; 78 Area
4xHBC = 300 SET / 300 TECH; 80 Area
HBC = 2.5% more area plus additional building costs
3xHB3, 3xHB4 = 300 TECH / 300 ENG; 90 area
4xHBM = 300 TECH / 300 ENG; 88 area
HBM = 2.3% area savings for additional building costs… and we’re talking really expensive building costs now
3xHB4, 3xHB5 = 300 ENG / 300 SCI; 102 area
4xHBL = 300 ENG / 300 SCI; 100 area
HBL = 2% area savings, I guess its nice that you were already dropping a full slate of A-fabs for the HB5 so its not really more expensive to use HBLs over HB5s if you also need engineers (also, 75 scientists is plenty lol)
Analysis:
The hybrid buildings seem to follow a pattern where they require more advanced building components for net fewer total fabs since only 4 buildings are needed instead of 6 (but at additional total cost due to more advanced fabs required).
HBBs - Should be utilized wherever possible to maximize SET/PIO utilization as it saves precious area
HBC - never build unless you only need 1 and you have a corner case example of just the right Settler/Tech count versus area to fit it in where an HB2+HB3 wouldn’t fit
HBM - I guess its kind of better, and maybe you only need a few engineers so getting some techs with it might be worth it. Probably will see these around the universe but probably not with regularity.
HBL - Basically better if you have scientists and engineers together, and if so, you already needed the a-fabs anyway - but only a few people will probably ever need to squeeze the last bit of performance out of a planet at the stage you need HBLs anyway.
Conclusion:
HBBs offer 10% area savings when fully utilized versus an equivalent number of HB1&2s
HBCs offer a net WORSE area
HBL/HBM offers around 2% area savings
If HBB is the standard (and I think it should be) then the following changes should be made:
HBC - 17 or 18 area ( 13% / 8% area benefit - I vote 17 area)
HBM - 20 area
HBL - 22 area
At the very least, HBC should be changed. I don’t expect anyone will ever build them, except in a very corner case situation of base area remaining vs. pop need.