Edit: removed population density comment because people were inferring an argument or defense from it, when that was not the purpose of it.
Unless you stipulate there's a goldilocks population density; if it's lower than that you don't get the investment, if it's higher than that there's too many people for the amount of spectrum/infrastructure. In which case, fair enough; are the places in the US that fall in that zone reaching speeds equal to Switzerland? I would contend no, not consistently, but of course, I'd need to know what that zone is.
That logic is invalid.