That's why the Gorsuch appointment was so important. I was surprised he didn't author the opinion, because he had signaled that it should probably be reversed before he was on SCOTUS. I still can't believe it's been overturned. I haven't felt this way - like a kid on Christmas - since a couple of weeks after Trump was in office.
It's almost impossible to overstate what this will allow Trump to do when he gets back in. The "Dictator" has returned power to the people by dismantling the agencies and "rules" that are really laws, which are made by the true dictators. He doesn't even have to do it. It's like he planted a poison pill that was activated after he walked a way. I don't think there's any going back from this for the deep state. Nothing Can Stop What is Coming.
I'm a regulatory attorney and not mourning this decision, trust me. But folks also have to be tempered in their understanding of what federal agencies can and should do. For example...I don't want courts or Congress deciding the specifics when it comes to landing light and taxiway procedures on airfields, or interference thresholds when using wireless frequencies. Leave those up to the FAA and FCC. Otherwise expect runway incursions and all of your communication devices not working when you wake up one morning. It's a tricky subject matter....
Chevron was around for only 40ish years. How did such things as you cite work before then? What was the legal constitutional theory pre-Chevron?