Expiration dates on laws

I saw somewhere that Musk had advocated for expiration dates on regulations. After a while, they have to be validated again by the legislature. If we could have some sort of campaign finance reform and campaigning reform whereby members of the House in particular could spend less time fundraising, campaigning and more time gaining domain competency through committee service so that they might know what the fuck they were talking about, on average, it wouldn't be the worst thing in the world.* 

But what about the Alien Enemies Act from 1798 and Trump's Orwellian invocation of it in saying we are at war? By contrast, of course, with Putin's even more absurd insistence that Russia is not at war. Shouldn't antequated laws like that fall off the books? Just like statutes banning sodomy and so on and so on. Or they should have explicit termination dates on them. We could have a culture where laws are expected to have end dates. Or classes of laws: class 1 is good for 50 years, class 2 for 20, etc. 

*Turns out there is an executive order out on this called Zero-Based Regulatory budgeting. The sunset provision (1-yearish) for it is probably too rapid to be executed in a non-chaotic way but it's not the worst thing Trump has proposed.