That's trivial to work around. It would lead to wasted resources where developers push out no-op "updates" to keep from being stale, and in the case of a sale a condition of the sale would be that the original developer pushes out some benign updates prior to the sale closing (or the new owner would push a few benign updates until people stopped looking).

In other words it would cause more work for good developers and extension reviewers and grant no additional safety.