But what it has done recently is allowed creation of much more powerful magnets. This is a new development, the practical application of these high temperature superconductors. I don’t know why it took so long to get there, but it has.
HTS was available in ceramic form, but ceramics sorta suck to work with. So potential users had to wait for people to make them into wires, which was apparently a fat pain in the ass, and then for that technology to be commercialized, all of which took until the 2010s.