You can indeed do what you describe. It is a sometime useful tactic in e.g. quest battles where you can kill a target then withdraw. An uncommon thing to do but

You can indeed do what you describe. It is a sometime useful tactic in e.g. quest battles where you can kill a target then withdraw. An uncommon thing to do but generally possible. But what you seem to describe are tactical operations, so they are happening on a tactical map. Sneaking up a group of units with stalk/forward deployment behind enemy lines then hitting the backline with it in an opportune moment when the main lines are engaging is a staple in a tactical engagement. As are the flanking maneuvers. You might not be hitting the workers or the production buildings but taking out an artillery piece is just as important and satisfying. Cavalry play has alot of the 'dodge the intercepting force' moments, etc. The high-end TW multiplayer play is not the same and it might not be as difficult as high-end Starcraft play but I have never found the apm requirements and the need to control both macro and micro at the same time an appealing challenge. And the single player campaign is just straight up better because of a sheer variety of what you are doing.