Then they can consult with experts, put it in a bill, and vote on it, instead of leaving it up to later extra-legislative discretion from political appointees with questionable expertise.
It sounds like you're referring to Locke's view on separation of power? He did hold legislative power supreme over the others like you say, but also noted that legislative power derives its authority from the people (consent of the governed), who have the right to make and unmake the legislature.
> And when the people have said we will submit to rules, and be governed by laws made by such men... nobody else can say other men shall make laws for them; nor can the people be bound by any laws but as such as are enacted by those whom they have chosen, and authorized to make laws for them.
Representation is now extremely poor in the United States. Colonial Americans enjoyed better representation on paper (though virtual) than the average American does today. People have better representation in Commie China. We're an extreme outlier among OECD countries, with over 700k constituents per rep. Compare Nordic countries, with more like 40k per rep, closer to the U.S. in the late 1700s and early 1800s. The only act of Congress I advocate for is repealing the "Permanent" Apportionment Act of 1929.