> As always, it's more complicated than that.

No, it isn't. All one need do is demonstrate that DNA is not the source of heredity, i.e. falsify the claim. That's how science works. Epigenetics doesn't disprove the role of DNA, it augments it, in the same way that conduction and convection stand alongside radiation as mechanisms for the transport of heat energy.

> But biological proofs are weaker than physics proofs.

Not the scientific ones.

> And speaking about physics, light was a wave and this had been tested and verified multiple times. Until it wasn't.

That's misleading. There was a debate about whether light was a wave or a particle -- evidence supported both views. Eventually a new theory combined and fully validated all the prior observations by showing that light is both a wave and a particle. That theory is the best-supported and most powerful theory devised to date, and is the crowning achievement of 20th century physics. And it will eventually be replaced by an even better theory, one that explains more, with fewer preconceptions and arbitrary axioms.

That is science at its best, science driven by evidence, evidence that shapes theories, theories that must survive testing or be discarded.