^ Natural ingredients like botanical extracts & essential oils, for example, have chemical profiles which are incredibly complex. So it's much more difficult to control interactions with other ingredients and/or anticipate adverse reactions/sensitivities from formulae with these than from something with a simple structure like "non-natural" mineral oil or silicones.
That doesn't means that if you have sensitive skin that you should avoid "natural" ingredients, after all, the #1 sensitizer in skincare in generally fragrance which would not usually be found in an all-natural-organic-type product.
Rather, that if you have senstitive skin and want to use natural products, don't assume they are hypo-allergenic and always patch-test before going full-face