I have proof. Science is proof.
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You may have perfect conditions at the site where you are making clones which may contribute to your success. The cutting has absolutely no way to uptake nutrients via direct contact with the phloem or xylem. No way to travel up or down through the tubes. It's also harder to clone a plant when cuttings are taken lower down on the plant where there is not AS much apical activity as the top of the plant...or closer to an outer node which is very swollen. At least this is my experience with plants. Of course every plant will have a preferred way to root a cutting, but really the big Two are water and media. Like I said elsewhere, not all plants are suitable for water roots, and more water roots do not function the way a terrestrial root hair does.