I'm not at all against modern (for want of a better word) medicine. It saves almost countless lives and those people who, for instance, refuse to vaccinate their children are IMO guilty of the most wretched kind of child abuse (both of their own kids, and everybody else's). If someone have a headache, no one should feel they can't have pain relief
But at the same time it's amazing how much Mother Nature provides us to look after ourselves anyway. For a start, how many 'modern' remedies actually come from the natural world to start with? Most famously quinine which is derived from the bark of the cinchona tree, or penicillin, which comes from a fungus. Or a huge number of herbs or other plant-based things which have all kinds of beneficial effects from relieving period pains to having antiseptic properties.
So many of us live in cities (me included) and we don't have the opportunity to wander into a meadow and pick the right leaves or flowers for whatever remedy we're after
But I think it's beneficial for all of us at least to have a little understanding of how we as human beings interact with and rely on the world around us (just as much as I think while we don't all need to raise our own livestock or crops, we ought at least to have a good awareness of where food comes from!).
And looking after the world around us, and looking after ourselves with wholesome food and good exercise - is natural health all of itself :)