Your examples are probably pretty good for explaining the depth of 2 regulated industries (except PG&E is a black eye for regulatory success), but perhaps they

Your examples are probably pretty good for explaining the depth of 2 regulated industries (except PG&E is a black eye for regulatory success), but perhaps they were talking about the breadth of all of the industries that Congress chooses to regulate, which is quite extensive. I'd argue that Congress critters and their staff aren't great at finding those "right sources" with enough consistency.