Tech is nothing more than a physical description of the ways they are different. Why they got better is audiophiles obsessed with and driven to achieve exceptional sound quality. How they got better was by trying out and evaluating different ideas by listening.
Switching from electrolytic capacitors to film caps has brought the focus on the materials used in the construction of capacitors. Electrolytics can sound poor because the insulator is actually an oxidized plate. Basically a capacitor is two plates separated by an insulator. Film caps allow that form of construction. Using high purity metal foils and Teflon insulators without the need to use a paste to oxidize a plate improves the transmission of a purer music signal.
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