An implicit assumption of the American political order is that a body that makes policy also has the ability to unmake that policy. I think that's good because otherwise there would be a land rush to create policies that are irreversible or have a higher bar for reversal than enactment. These policies would inevitably become out of date and reversing them could be politically impossible.

The big exception to this was the drafting of the Constitution itself, which arguably was easier to ratify than it is to amend. The problem of the practical impossibility of undoing past policies applies very much here.

The Constitution was very difficult to get ratified. For one thing, it was recognized that it had to be unanimous. Don't forget it was replacing an existing political order of the Continental Congress + state governments.