Because everyone in these replies is in complete denial about the physical limits of memory and scaling in general. Ya'll literally living in an alternate reality where model capability increases with a decrease in size, its simply not the case. There will be small focused models that preform well on very narrow tasks, yes, but you will not have "agents" capable of "building most things" running on consumer hardware until more capable (and affordable) consumer hardware exists.

Ah, you haven't realized that consumer hardware gets more capable over time