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Actually, it is a physical requirement that erasing information generates waste heat. https://en.wikipedia.org/wiki/Landauer%27s_principle

We're still pretty far from that limit, but unless your plan is to never erase bits, you're going to waste energy.

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> On the other hand, recent advances in non-equilibrium statistical physics have established that there is no a priori relationship between logical and thermodynamic reversibility.[19] It is possible that a physical process is logically reversible but thermodynamically irreversible. It is also possible that a physical process is logically irreversible but thermodynamically reversible. At best, the benefits of implementing a computation with a logically reversible system are nuanced.[20]

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