Dualism is just the philosophical equivalent of walking:
- Fall forward.
- Catch yourself.
By repeating this sequence of two steps, you are walking, a process vastly superior to your former crawl. But the truth is that walking is much more complex than those two steps. In fact, those two steps are simply a gross oversimplification of the true, complex reality that is occurring when you are walking, and that oversimplification is primarily due to the limited capabilities of the conscious human brain.
There is no doubt that dualism is superior to its predecessor, but it carries all the limitations of binary thinking. In reality, reality itself is a complex collage of variable, broad-spectrum states, of which dualism talks only about the rarely experienced extremes. Reality is composed of sliding scales, and dualism is focused on the labels roughly anchoring the minimum and maximum locations on those scales. But there is so much more than just walking! There's skipping, hopping, jumping, running, more exotic controlled falling (diving, gymnastics, vaulting, parcours, etc.), and endless variations and extensions to self-movement. The same is true for philosophy. By focusing on the extremes, that limited binary condition, a whole universe of real-world activity lying between the two extremes is ignored or trivialized.
But, you have to crawl before you can walk, and walk before you can run. Just don't think that walking is as good as it gets, because it's not. Neither is dualism.