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Its 99 years since Einstein published the paper on the photoelectric effect whith had far-reaching consequences. [1]

And 93 years since the first Solvay Conference. [2]

[1] https://en.wikipedia.org/wiki/History_of_quantum_mechanics [2] https://en.wikipedia.org/wiki/Solvay_Conference

What's your point? Everything they did, including Einstein's (and everyone else's at the time) quantum mechanics work, was based on continuous space and time variables.

Quantum mechanics does not mean everything is quantized. It got its name because the first predictions of quantum mechanics were quantized energy levels in some example systems, but that does not even mean that all energies are quantized in quantum mechanics. There are many systems you can study where energies are continuous, and many examples where other quantities are continuous in quantum mechanics.

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