Constitutions are factually much less sticky than formally, as ultimately words require interpretation. When the law can't be rewritten, it will just be reinterpreted.

Here's a reasonably well known monograph about the topic:

John Hasnas, "The Myth of the Rule of Law", Wisconsin Law Review 199 (1995)

https://medusa.teodesian.net/docs/liberty/MythFinalDraft.pdf