Being very difficult to change is a feature, not a bug. The entire point is that the constitution shouldn't be a fashion accessory that's changed on a popular whim. I agree with this because I firmly believe that a million stupid people won't make better decisions than one stupid person.As far as I can see that claim is contested. But it may be a valid one, I admit.
Really seems that the US constitution is designed to make changing anything nearly impossible. I really don't get why its so venerated, it seems like a bad design, to me. Indeed, I don't get the preoccupation (as seen in this article) with the idea that it was all carefully 'designed' at all. Surely the reality is it came out of a lot of horse-trading and botched compromises between rival centres-of-power? Some of it, I've heard, just because everyone involved in drawing it up was knackered and wanted to go home.
I tend to think formal written constitutions are over-rated in general. They never work as planned, because nobody can foresee all future social and technological developments. The main thing is they should be easy to change. Any constitution that isn't, is a bad design. A rigid constitution suggests a deep distrust of 'the people'. If you distrust your populace so much, why not just stick with a monarchy?
We have people that set off fireworks in their ass, eat laundry detergent, believe the earth is flat, think rocks have magical powers, the list is near endless. I don't want those folks changing the constitution because they're incapable of understanding the consequences of their actions.