US still favors family based immigration system . So "highest" doest count in this context when compared to points ( skill) based system in other countries like UK.
The UK sort of has both, family and skills can get you in. Recently, they have started to de-emphasize the family visas.
With points, you are at the mercy of the market of the host country. The UK has, recently, restricted the high-tech industry in some areas, but hairdressers are still in demand under the points system. So someone with a BSc may actually be less qualified than someone that went to beautician's school under this scheme.