You are correct that it would just be another kind of labor regulation, but the us is institutionally biased in favor of employers and against labor protections

You are correct that it would just be another kind of labor regulation, but the us is institutionally biased in favor of employers and against labor protections and it’s always been an uphill battle to enact them here. When they are enacted they are furthermore frequently rolled back or effectively neutered by lobbyist interventions in later congresses. You can speculate and theorize about the reasons why, but the US is almost uniquely hostile to worker protections and benefits among developed countries.