From Kagan's dissenting opinion:

In recent years, this Court has too often taken for itself decision-making authority Congress assigned to agencies. The Court has substituted its own judgment on workplace health for that of the Occupational Safety and Health Administration; its own judgment on climate change for that of the Environmental Protection Agency; and its own judgment on student loans for that of the Department of Education. See, e.g., National Federation of Independent Business v. OSHA, 595 U. S. 109 (2022); West Virginia v. EPA, 597 U. S. 697 (2022); Biden v. Nebraska, 600 U. S. 477 (2023). But evidently that was, for this Court, all too piecemeal. In one fell swoop, the majority today gives itself exclusive power over every open issue—no matter how expertise-driven or policy-laden—involving the meaning of regulatory law. As if it did not have enough on its plate, the majority turns itself into the country’s administrative czar. It defends that move as one (suddenly) required by the (nearly 80-year-old) Administrative Procedure Act. But the Act makes no such demand. Today’s decision is not one Congress directed. It is entirely the majority’s choice.

[...]

The majority disdains restraint, and grasps for power.

What do you need Project 2025 for when you have the unaccountable conservative majority on the Supreme Court?