Some difficulty is not a bug, but the current amount of difficulty was probably not intended.

Most of the drafters understood that it was important for a government's founding document to strike a balance between two unsustainable positions: immutability (leading to a sort of tyranny of the old and dead) and excessive mutability (leading to short-term thinking and political instability). Our current approach to amending the constitution has favored the former position, to poor effect.