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After the dust had settled, Tony had offered to build Bucky another prosthetic (or 50) with different functionalities. Even one that matched his other arm. Made to fit with the Wakandan socket in his shoulder.
But Bucky had flinched hard and so Steve's protectiveness had reared its head. He didn't tell Tony to stick those arm designs up his ass. He did tell him to keep his ideas to his suits.
He really should have expected this.
Seeing Bucky's look of awe at the suit modelled after him standing with the other mechanical avengers was well worth the headache, though.