I couldnt care less if it impressed foreign leaders. They arent paying our taxes.
Perception is Reality when perceptions drive reactions. Again, you may not like it but it is the truth. Obvious displays of power are a part of international relations. State visits and such have a protocol and format that have been long established. All the participants know the rules and while it is mind numbing to those who wish to see real, efficient action taken it is the only way to get things done peaceably on the international stage.
Impressing foreign leaders is important.