I understand where you are coming from, but the mine is faster than the constructor in most cases which at least for me when I felt like I needed around 3 or 4 by the time i got the splitter, felt weird considering my past experiences in similar games. I'm more wanting the option to produce rods and plates simultaneously to ramp up production overall with one mine.
It's not awful don't get me wrong, just an inconvenience I had in my first playthrough and was wondering if anyone else was having the issue