What if, for example, there was a control group of mixed units for front-line combat purposes, such as, say, Fencers, Venoms, and Outlaws, but then all of the Outlaws in that control group had to be sent for repairs, while at the same time, more Fencers and Venoms were constantly being produced to bolster the control group through Ctrl+Z spam? When combined with the fact that repaired units automatically return to perform their previous order, do you now see the problem there, how, since those Outlaws weren't present when I was trying to update my control group through Ctrl+Z, they need to be re-added in manually (including any Outlaws that were produced during the time the others had to be repaired), with risk that lone Outlaws, after being repaired, are sent to certain death without the rest of their control group backing them up?