This is brilliant, especially if this kind of approach was adopted in policy development. Chunks of vetted “code” that is transparently shared and can be used by other governments facing similar challenges…imagine…
It often seems like a trick to make is so that nobody really knows what they're voting on, as opposed to a wholesale "replace that entire section with the readable information below". I suppose, to be charitable, it may have originated as a conflict-avoidance strategy.
Ideally, bills would be changesets that can easily be turned into before-vs-after comparisons for legislators to review and approve.