This is a worthy article and it is fair which is refreshing. It clarifies the real constraints under which the USA must execute its foreign policy. It also becomes clear why it moves so slowly if at all.
Presidents have involved themselves in foreign policy because they can without much serious constraint. In everything else they usually appeared to be bogged down. Yet this outlines the real world constraints.
Unfortunately, doing nothing is also an option and often the unwise one. It really means that all choices are bad as present day Iraq shows us.