Brave New World debuted adamantium in the MCU, which wasn't always the plan for the precious metal and its consequences.
The brave new world that Captain America inaugurates requires a better metal, a metal like adamantium. That will become even more apparent when adamantium gets bonded to Logan’s skeleton ...
No Weapon X yet, but Captain America: Brave New World marks the arrival of adamantium to Earth-616 ... That said, the metal that covers Wolverine's skeleton had an entirely different origin ...