We also don't know its critical field strength. The original measurement from Korea was low. That could improve as they improve synthesis, but could be problem with the material. There are lots of high temperature superconductors that aren't useful; YBCO is important because of high field strength and liquid nitrogen coooling.

I'm sure there are lots of uses for low current room-temperature superconductor. But powerful magnets and long-distance power transmission require large currents and big magnetic fields.