Headlines about Supreme Court cases are almost uniformly misleading, because they suggest the Court is making decisions on policy issues rather than legal issues. The very first words of the opinion, on p. 2, make clear that the legal issue before the Court is very different: https://www.supremecourt.gov/opinions/21pdf/20-1530_n758.pdf The Clean Air Act does not purport to give the EPA blanket regulatory authority ov…
So the EPA is kneecapped since they have to go through the most ineffective and hyper partisan congress since the founding of the country.
It doesn't help that taking action on matters of national importance is inherently difficult in a Federalist government.