The count argument would be that building with AI will potentially give you infinite customizability, which is especially attractive if you’ve ever hit a brick wall using a line-of-business SaaS product. It works great until you hit that wall.
But again, I think this counter argument oversells the value of customization. Most users-would-be-builders would happily build a monstrosity that doesn’t even serve themselves well, if you let them. Building good workflows (and therefore good SaaS products) is not nearly as easy or straightforward as it seems.