And technically the flow rate of circulating water goes to zero at surfaces. Water and chemicals get to surfaces via diffusion while circulation has more to do with the size of that diffusion layer and therefore the net rate of diffusion through that layer. This is why brushing the pool is still important even with proper chlorine levels, especially with plaster or other somewhat "rough" surfaces.

In practice, we don't see pool surfaces in most pools properly maintained getting slimy or having noticeable biofilm with the possible exception of just above the waterline on tile or in spas and above the water in skimmer baskets, etc. That's why the question was asked about circulation and why brushing is still recommended.