If you could rate policies by how good they are, you'd could get a couple categories: clearly bad policies, these don't get implemented. clearly good policies,

If you could rate policies by how good they are, you'd could get a couple categories: clearly bad policies, these don't get implemented. clearly good policies, these get implemented broadly. things in the middle, these get debated a lot and some get implemented in very limited scope and then we learn if they should be expanded or not. The ones that do get expanded are going to have a lot more visibility and presence in the general consciousness than those that don't. There's also a lot of factors that tend to discourage implementation and it's very common that the perceived value of policies increases significantly after they've been adopted. There's basically just a lot of things going on such that the natural result is that the scope of policies increases over time. And that's a good thing.