Could you elaborate about “wildly wrong”?

I am not an expert on this, but random internet searches such as [0] indicate that common materials, like high strength steel, are susceptible to both diffusion and embrittlement at room temperature

[0] https://www.energy.gov/sites/prod/files/2014/03/f10/pipeline...

Those tests seem to be at >200˚C if I’m not mistaken. Hardly room temperature. Regardless, the main trick is to avoid using certain types of high-strength steel, line exposed surfaces with polymers, or using composites where ever possible. The problem is for the most part solved.

So you're admitting the problem exists, which is my entire point.

It's hardly a theoretical-only problem, either:

https://en.wikipedia.org/wiki/Eastern_span_replacement_of_th...

In the same sense all chemicals have handling issues. In practice, it is basically solved.

That's probably due to them using a vulnerable alloy, and was likely exposed to hydrogen while at a high temperatures. This is nothing like a gas tank filled will hydrogen.

What's a high temperature though? -50C?

Well into the hundreds of degrees C.