switchmode gyrator

Inductors are awful. Their energy storage is worse than electrolytic
caps by about a factor of 1000.

https://electronics.stackexchange.com/questions/326177/energy-density-comparison-between-inductors-and-capacitors

One could in theory make a switchmode gyrator that would make a
capacitor look like a programmable-value inductor.

I have an application for that, but it would take too much engineering
and runtime complexity to make it worth doing. I guess I'll just have
to buy a bunch of giant, heavy custom toroids.