Important distinction: Trump fired me for no cause (at will), but tried to fire Cook for cause (pretextual). The court said 'for cause' removal is valid for the Fed but not the FTC—an intellectually incoherent, outcome-oriented distinction.
Only two justices (Roberts and Kavanaugh) made this distinction; the others said all could be fired or none. It seems driven by protecting the Fed's economic role, not consumer watchdogs.