Entropy is not a physical quantity, it is a measure of how far a system is from equilibrium.

Lots of people talk about order/disorder or macro and micro states, not realizing these are things we've invented and aren't physical in nature.

That’s funny because the original thermodynamic entropy is defined only for systems in equilibrium.

It doesn't make a lot of sense to me because a system at equilibrium, cannot go undergo any further diffusion, so there's no potential "entropy increase"

Maybe the issue, is that, like an ideal gas, a perfect equilibrium just doesn't occur.