For one, that might be the user's intended play style, to get through faster. Secondly, you can manage both club and national teams simultaneously which Im sure most people who like to build a nation would do and not to mention building a nation should be focused on International team.
To answer you question, outside of playing games, your job is to scout and find players as well as hidden youth for the future. As of now, the scouting in this mode is non existent.