I do think that's a lost, I hope they took it away so that they can bring a similar mechanic later, because, for some player atleast, it was a whole fun-tertainment to be ourself one of our troops.
It's because now you can control any unit and also multiple units in the game. There is 2 keybind in setting. (I think default is crtl + click on an unit, and G to rally units, but i don't remember)