How intelligent is CTS?

I assume from what I read from the module, that CTS is "an instantaneous output and will change also with time". That would mean that CTS "strives" to keep the boat on the course line. But there are cases where the current flows to one direction, and then reverts to the opposite direction during the estimated time of the leg. If you're lucky, this can result in negating the current effect all together, with a resulting "S" track, that can, depending on the wind direction, be more efficient than merely sticking to the course line. Are there instruments that take that effect in consideration, or is that only taken into account by weather routing software?