I used a serrated voyager for years cutting through solidified chunks of plastic as thick as a person's thigh nearly every day without a single resharpening. I also did much trimming/garden work with it in my grandmother's yard when she needed help. It stayed sharp until I changed jobs and got bored of the serrations. I have factual proof that it is fit for the job, and the 5" blade of the XL ensures that it will be less work to trim thicker plants if need be.
Please relate a real world experience where the Salt has done something similar for you. Reading information on websites is all and good, but if you're going to bash a suggestion, please have proof of both the inferiority of what you are bashing, and the superiority of what you yourself are suggesting.
There are TONS of examples of CS serrations breaking cutting things like CARDBOARD. I didn't break mine on cardboard(I broke one on a zip tie though) but it got ridiculously dull breaking down ONE box. I've never broken a Spyderco serration on cardboard or zipties, and I've never dulled a Spyderco breaking down a single box.