Huge advances, yes, defying the laws of physics, no. The issue is heat dissapation, with such things as laptops this is easy reduce voltages ipso facto currents thus lower thermal budget and shrink case. High power devices cannot by thier nature be adressed in this way, until breakthroughs are made in room temperature superconducting materials ΔT will always be high in large current applications.
Ignore thermal issues and a laptop sized inverter is achievable, just chuck it into a tank of fluorinert with a chiller and away you go.
Glenn