For less experienced players, rushes like these tend to end the game early rather than begin it in an interesting way. Either the defender knows how to hold the strategy and shuts it down, or hasn't seen it before and gets destroyed. While these strategies are certainly part of the game and make high level competitive games far more interesting, it is often a frustrating experience for low/mid level players. Many of those players are looking for an experience where they build their army for a while and attack once they're satisfied with what they've built. Certainly not strategically optimal, but that's often what they find fun.