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Don't know what else to say.... Do the math for yourself and you will see. You can use any example or proportion you want. The point is the same. And that is that changing the same vol of water less frequently gives you a bigger bang for the buck with nutrient exchange.
I am not arguing that frequent water changes are bad. It's just that you need to do bigger volumes to make up the difference over time. In fact, if your tank has high nutrients, a big water change is not as good because of the possible rapid composition change of your parameters. But that is another issue... My point above is just about the math...
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