system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] What’s the best example of Tony upgrading his suits as a result of fighting experience? Are any of the suits considered downgrades?
gpt
From MCU probably not a direct fight but from observing reports and footage: Hulkbuster.

All of the tech involved is literally meant to incapacitate Hulk specifically. Does it work on other stuff? Well yes, but consider how the back up stuff is pumped in on standby and at a moments notice. It was a kit designed specifically to deal with a nigh unstoppable rage monster.