I wonder if he looked at Adaptive Replacement Cache[1]? It's supposedly the best of both worlds of least recently and least frequently used and the only reason

I wonder if he looked at Adaptive Replacement Cache[1]? It's supposedly the best of both worlds of least recently and least frequently used and the only reason people don't use it more is because of IBM's patent. [1] https://en.wikipedia.org/wiki/Adaptive_replacement_cache https://en.wikipedia.org/wiki/Adaptive_replacement_cache