At high pressure might be to superconductivity research what in mice is to medical research.

That doesn't mean that it is not useful to conduct these experiments. They could give further insights into how superconductivity comes to be - or maybe discover a superconducting material that requires high (but not too high * ) pressures to form but remains stable when they are lowered back to normal pressure similar to how diamonds are stable at normal pressures but are require high pressure to be formed.

* Pressures only reachable by using diamond anvils would be highly impractical to produce any useful amount of material ;)

I wonder if there might be a way to utilize the same effect that creates a Prince Rupert's drop to create that sort of stress in a superconductor. Sure, it would be fragile but it would also be stable without external forces applied. The stresses contained within the surface layer of the bulbous end reach as high as 700mpa which might be increased by using better materials and colder "shock" processes.