New or old micro idea?

  (Edited: )

Since there is a certain amount of shots to kill a unit (i.e. x number of stalker shots to kill a hellion), doesn't it make sense to make  command groups of that number of units. That way you have multiple command groups that 1 shot a unit. Seems like a good idea to me because it would prevent good micro from him and start killing off his units quicker. Is it just too difficult to do?