It's a flawed document that has lead to a flawed nation. It does not have Messiah-like abilities to deal with current problems so why be surprised it doesn't have modern solutions to modern problems.
Sure, NOW that's standard. At the time, it was not.
> the US Constitution is set up in a way that its most severe flaws can't be fixed
This isn't a flaw at all. It is meant to ensure the broad geographic consensus is required to make fundamental changes.
Reducing the political power of rural communities might be popular today among urban communities, but it is a recipe for escalating division and ultimately rebellion.
There is great value in giving out-sized political power to remote colonies and communities. Further centralizing power in the capitals is a path to fascism.
We are lucky that they were able to pull it off. It really could have fallen apart. But it didn't. And for that they deserve an enormous amount of veneration.
The ceremony of interpreting the document is all a bit silly, but it's better than letting they majority party write a new one.