How can the USCON being Vagueness be seen as a Strength and a Weakness?

-Strength: Makes sure the USCON is Reinterpreted over time, without the Need for Long, Painful Amendments. Abortion is a Prime Example -Weakness: Branches of Government can Expand their Power which can Diminish the other powers given to the Other Branches or the States in the USCON. Example: Power to Declare War