Coherent light produced by lasers is not microscopic, we see its traces in the air. And we see the consequences (old fashioned holography and the ability to cut things with focused light, even at large distances). Room temperature is fine for that.
Superconductors used in the industry are not microscopic (and the temperatures are high enough to enable industrial use of them in rather common devices such as MRI scanners).
Decoherence means that different branches don’t interfere with each other on macroscopic scales. That’s just the way it works.
Superfluids/superconductors/lasers are still microscopic effects that only matter at the scale of atoms or at ultra-low temperature or both.
No, not microscopic.
Coherent light produced by lasers is not microscopic, we see its traces in the air. And we see the consequences (old fashioned holography and the ability to cut things with focused light, even at large distances). Room temperature is fine for that.
Superconductors used in the industry are not microscopic (and the temperatures are high enough to enable industrial use of them in rather common devices such as MRI scanners).