> And it also doesn't make any sense, since defintionally a material can't be superconducting and semiconducting at the same time

I'd say it gets interesting if one can get at least part of a die made out of superconductors. Getting power in into the die is a huge damn challenge, we're talking about hundreds of amps for modern CPUs and GPUs - if even a part of that could be shrunk that would be a huge gain.