Why have capacitors improved so much over the years?

For the interested:
Picking Capacitors - Walter G. Jung and Richard Marsh (reliablecapacitors.com)
No affiliation.

Everything has improved over the years.
Defects introduce colorations.
Some prefer the colorations.

jfd11,
Who was it? Not much of a story without the name.

+1 roxy54!

It’s market driven. Who cared about capacitors 20 or 30 years ago. People like us who tweek and upgrade electronics have found that capacitors make a difference in sound quality. Like changing tubes and interconnects.