Outside of relativity, he was one of several dozen individuals ... and hardly the most profound of those. Bohr, Heisenberg, Planck ... Einstein is certainly no more important than any of these. One of the most important contributors, OK, if you extend the group you call "the most important" to include dozens of individuals. Even in terms of just photoelectric effect, Einstein did little but elaborate a small bit on the work of others; it was originally known as the "Hertz effect", after Hertz, who laid down the foundation for its understanding.

You have to follow the thread from the beginning to understand the context. Nothing Einstein did has anything to do with the development of television and computers (see earlier posts in the thread). The theoretical science behind these developments was mostly developed from the late 1700s through to the 1800s. From there in, it was principally engineering.

However, relativity was understood for quite some time - since Galileo. All Einstein did, in effect, was propose that it be applied to electromagnetic effects, in order to reconcile Maxwell's electromagnetic theories with Galilean relativism.

Photoelectric effect - once known as Hertz effect - was just elaborated on by Einstein (whose elaboration was only one of many later revisions, including the much later Compton effect). So he neither discovered the basis of it, nor did he resolve it fully. He made a contribution, like alot of other scientists did. Later ones made equally signifigant contributions to wave-particle duality, for instance de Broglie, who proposed that all matter and energy exhibited properties of both wave and particle, not just light.

Even in quantum physics alone, Einstein should not be the quanta deity: there are simply too many others, Planck, Heisenberg, Schroedinger, Bohr, de Broglie, whose contributions are at least equally important (if not, in some cases, more important). Einstein was simply amenable to pop culture status.