Tell be this the situation you just described how does teching delay factor into this. It's pretty evident that your talking abut a point were both parties are fully teched. Tell in this situation what significance teching requirements have now.
Don't forget the argument.
You talk about... delaying what here actually?
Because there is a difference if you get 7th man con at T3 for extra cost or couple of minutes later at T4.
Do I need to explain to you performance difference of upgraded infantry vs unupgraded infantry in timing when there are tanks on the filed vs when there are not?
I feel like you're asking me to explain to you basic RTS mechanics here, because you most certainly have a hard time understanding something here.