If Trump Does NOT have power to fire employees in the Article II agencies, what power DOES he have?

Does he just have power to breath in and out? Just to eat food? Just to walk around?

Was George Washington thus limited?

How about FDR?

How about JFK?

Why do Article III Judges suddenly have supreme power over all that Trump does?

Do I have the ONLY copy of the Constitution?

Or is it just me who can read?