i am ok with this idea if it is gonna be optional
30 seconds while factory is building is often not enough to think about your BO, check your allies and their factions, assign roles, check reclaim, decide who take what mex and who drops where, whos gonna make t1 air and who does not... tho ofc if you are playing air fac 1rst you will need to decide that before game or for like 1 second.
decide where your engies gonna be going...
how to fix resource problem? just discount the amount of resources that ACU produces for the time that you need to make a factory.
also there are maps where you start in water.
there are maps where you have "desired" factory position kinda blocked by commander so you need to choose between moving and placing factory in non-cool position
That also removes plays where two people could make factory together
also that messes with the BO with 1rst pgen
and on crazyrush you often start with pgen.
on super mass-poor maps you can start with mex