Isn't it just a lawmakers' version of diff? :) You just can't conveniently apply it automatically to compile the resulting text.

>Why the hell you not just rewrite the old law and bump the revision?

Because it's aimed at lawyers and judges who have to be up-to-date with all changes and its easier for them to remember "section 123 was amended in 2026", than to recall a whole new revision and mentally compute the difference.

It's also why you often can see skipped items (e.g. 1, 2, 4, 8, 9, 10). Because humans often think in terms of "<..> code, section 123", not "<..> code, revision 24, section 123, which was section 130 in revision 20", so when you remove a part, it's more efficient to leave an empty space and to not reuse it later.