There isn't an issue with resistive heating. The safety margin is down a few factors from the 8-pin PCIe adapter, but there is still a healthy safety factor.
This isn't like running kA of current where the threat of thermal runaway is always present, even with active cooling. I worked on a stellarator that had a coil feed blow (years before I started). Pushing even 10% more current meant a complete overhaul of the feeds. That's what thin margins looks like.
It’s only a healthy safety factor if absolutely nothing goes wrong. Connectors are normally a weak point and internal PC components aren’t supposed to be plugged and unplugged regularly. Simply testing the multiple hardware configurations can quickly result in failures.
https://twitter.com/hms1193/status/1585257428291325958
This isn't like running kA of current where the threat of thermal runaway is always present, even with active cooling. I worked on a stellarator that had a coil feed blow (years before I started). Pushing even 10% more current meant a complete overhaul of the feeds. That's what thin margins looks like.