It's not, really. In Seila Law v. CFPB (2020) the Supreme Court ruled that even directors seemingly protected by for-cause language (which the FCC charter does not have) can be removed at will unless the agency in question "exercises no part of the executive power" and is "an administrative body ... that performs ... specified duties as a legislative or as a judicial aid." https://en.wikipedia.org/wiki/Seila_Law_LLC_v._Consumer_Fina...
In 2020, five years ago, was essentially the exact same court as today, except KBJ replaced Breyer. The precedence in question dates to 1935 Humphrey's Executor v. United States where a conservative Supreme Court sought to cut back executive power of a liberal president. Now we have a conservative Supreme Court expanding executive power for a conservative president. If you think the Roberts court would have let Joe Biden have this much power well then I have a bridge and some student loans to sell you
Do you have a case which was not about the executive authority of Donald Trump specifically? When we talk about how controversial or how new this interpretation is, the question I really have in mind is, why should I believe that it was developed out of genuine legal analysis and not an unprincipled desire to give Trump more power?
> 2020