[saberdancer]

It misses the point.

Ceramic "high-temp" ones are not used because they still operate at very low temperatures so you are not completely free of cooling requirements, they are just slightly lower.

In that case it may make sense to use superconductor with better material properties in exchange for more cooling.

A room temperature ambient pressure superconductor would remove the need for special cooling so it would be vastly better than current "high" temperature ones.