> If an invention is small enough that someone can make it without spending significant resources, it is probably obvious enough that you shouldn't be allowed to patent it, because it is more likely other people incidentally have the same idea than they are "stealing" it.

The resources spent on an invention is typically a terrible measure of novelty or inventive step.

But I agree, patent law should to a greater extent protect the investment that goes into realizing an invention, and less the invention itself. For example I think it’s absurd that you can patent stuff that you have no intention of building or offering for sale.