A few people have pointed out the incoherence of overturning Chevron and giving the executive absolute immunity and it may really be as simple as encouraging the Presidency as personalist rule.
Chevron + Schedule F fucks with the civil service a lot and will be very difficult to unwind, which is pretty much the point
They're doing what they want to do, deprofessionalize a branch of government which will tell them no
That's all this is about