And all it serves to not be able to build radar and facs with sparkies is needless micro of having to go and pick out the specific t1 engie in a mix near your sparkies because you cant just select all your sparkies and your engie and use a hotkey for fac or radar. It's annoying and tedious and unironically like a third of the reason I don't bother making sparkies.
Yeah, it's just this quality of life improvement that makes it slightly less annoying to use sparkies. And it's the same QOL improvement for sparky drops and not having to bring a t2 engi along like farms pointed out, and then also have to be careful about which engi you select when you want to make the radar and/or factories at your proxy and then make sure your sparkies assist it and hope the t2 engi doesn't die to a couple bombers that a sparky would survive.
It's just something that would save you a few really annoying and seemingly pointless clicks.
And the difference would be efficient scaling, if you make t2 engies you're getting more bp for mass. If you make sparkies for scaling you are falling behind and paying a premium for the additional security that the rest of the sparky brings.
This is also 100% true. I think we can agree that giving sparkies this functionality would not make that big of a difference in the game. A small increase in mass cost would be fine as payment for saving the annoying apm.