Lol the same argument can be made for almost every other tower.
But on every other tower It wouldnt work. None of the blacked have anything to put themselves against to Stand ground on any single point either. They'll get kbockback which will make things a lot more difficult to defend as well. Unless the attackers your talking about are complete noobs it just wouldn't work. People would just slash them to the side and run past since yes, they are choke points but if you move em to the side one you can get past. Every regular tower has tons of choke points. Why should this be any different?