> DEA, ATF, FDA, OSHA, CFPB, CDC, EPA, and FCC would all tend to disagree with this assessment.
They wouldn't, at least not to a court's face. You mention "Chevron deference" below, but the whole idea behind Chevron deference is that agencies are exercising executive discretion in enforcing the law, not making new ones.
> There IS a separation of powers and checks and balances. Congress even passed the "congressional review act" in 1996 which allows them by a majority vote to undo an agencies decision if they feel they've stepped too far.
The Constitution gives the power to make laws to Congress. Full stop.
> Rather than apply straight forward and obvious rules that have been around for at least 30 years (Chevron deference), the supreme court has decided to take a politically activist route and instead decide cases based on their own political leanings.
Judges in the mid-20th century engaged in massive political activism to rewrite the Constitution from whole cloth. Undoing that tomfoolery is not itself "political activism."
> You can predict, like clockwork, how the justices will vote on any case with any sort of political implication based on who appointed them. Isn't that distressing?
It distresses me that you can predict how liberal justices will vote on any significant case. It brings me great relief that conservative justices are full of surprises. Just in the last few years, ACB was supposed to overturn Obamacare (she voted to uphold it), Gorsuch and Kavanaugh were supposed to find that the Civil Rights Act doesn't protect sexual orientation, etc.