
The Mark 85 nanotech suit relies on energy amplification for its repulsors, which vibranium isn’t designed for. Instead, Tony created his own synthetic elements and alloys, evolving his suit beyond just durability. Besides, vibranium has weaknesses, such as its vulnerability to sonic attacks, which could compromise an Avengers Endgame-level battle.
This is why Tony always relied on his own Stark Industries innovations rather than external materials. From his first suit to his MCU secrets-packed final battle, every upgrade proves that Iron Man always learns from his mistakes.