True brother, yet what i forget to mention to mention is that i use to leave the gates open until the wave that enters is something i can handle, close them to kill the incoming and open them again. At least in the first minutes of the purge this way was working. Eventually the demolishers would brake it and i had to retreat more to control the waves on narrow passage. But this was the way i started with purges, not anymore.
Yet you are right, an open gate is not an obstacle for purge creation :+1:t6:.