I wonder about "Chesterton's Fence" effects, though - maybe we'd have to make a _lot_ more use of the "institutional memory" of the non-political parts of government. Behind every law, there's usually at least some advisory recommendations / reports from various agencies, and over 10-30 year timescales there's a non-zero chance that some of the original authors of those are still around.
Otherwise, we'd run the "junior developer" risk of perpetually refactoring laws without understanding the reasoning behind them, and breaking functionality users depend on in the process. Sure, it's obvious that some blue law about not pasturing your cow on ye towne grasse on ye Holye Sundaye is outdated, but I suspect those obvious deprecation cases are few and far between. Thoughtful, context-aware refactoring applies to systems in general, not just computer systems.