I assume this is working as intended, but I just wanna confirm it: Is it normal that CMCs don't actually use their mass driver to send the mineral packets?
I noticed one of my CMCs having a production of over 5k and thought that I may need to send them a second mass driver, since they only have a capacity of 5k, but then I noticed that there's absolutely no difference if there's one or two mass drivers on the CMC, the mineral packets contain the same amount, and then I also noticed that they continue to send packets just fine even if I delete all their mass drivers.
Either way this is actually nice, because it means you don't have to micromanage your CMCs and check if they need additional drivers.
SJW: Yes, that is working as intended. I didn't want civilians to worry about having to manage mass drivers and there is no real gameplay impact for players.