This argument is as old as programming. High level language programmers don't understand everything as good as us assembly programmers, etc. I don't think it's

This argument is as old as programming. High level language programmers don't understand everything as good as us assembly programmers, etc. I don't think it's relevant for evaluating tools. It is only relevant when hiring as you would like to find developers that is competent enough to grasp low level stuff at least at a rudimentary level. In this case some side interest in routing frameworks might be indicativ regardless if they prefer to work with angular.