Problems with Permaculture?

So for my speech and debate team I decided to do a speech about the problems in the agricultural system, and the answer to these problems will be permaculture(obviously) and I I need some reasons for why permaculture is bad so I can rid any concerns that might exist. Also, I’ve heard arguments like it can’t be automated, won’t produce enough food, and it uses invasive species, so new stuff would be appreciated.