Simply because you're not a fan of the outcomes doesn't mean that the appointments of justices Gorsuch, Kavanaugh and Barrett were illegitimate. Chevron deference started under the Stevens court and the deference it entailed related to the Reagan administration. That this has become a conservative hobby horse since then has nothing to do with policy preferences that only cut one way in a partisan way, and has everything to do with a deeper disagreement over the separation of powers and the role of the judiciary. Chevron deference isn't "the system" it's simply one precedent that has been faltering for years. There's no reason for any "side" to see this as the sky falling unless you really, really want to preserve some federal regulation that is TOO IMPORTANT to allow statutes to clarify.