I do not understand.
You hit sacrifice on your factory that producing units, engy comes and sacrifice himself and dies, factory now have +4 or 5 BP? for what period of time? :O that actually sounds too cool, it is like protected ingeners inside of factory, even if you cant use them in any other way anymore
I imagine team game when aeon player sacrifice engineers to uef land fac connected to 2 t3 mexes, and they spam percies FTW
indeed it can make adjacency bonus OP
so i do not think it can apper in FA
at least you can make BP assimptotically increas to N*BP (n=2 you can double BP of factory), it's like 1rst ingeners gives +5 second +4 third +4 4th +3.... 15th gives 0 BP or 0.1 xD
anyway i do not like random changes, we need only solve problems without making all factions same