Earlier quoted context omitted.
In your analogy, wouldn't tailwind be more of a multivitamin, in that it contains a bunch CSS classes (vitamins) conveniently packaged and ready to go? I haven't used tw yet, but I intend to because I was blown away by how much sense the authors' book Refactoring UI made.
Taking multivitamins is usually the wrong approach. So they are indeed a kind of snake oil. Which condition do you intend to treat by taking multivitamins? Have you looked at randomized controlled studies and found that they support your idea that taking MVs has a positive effect on that condition? Have you got your bloodwork done? Did the doctor then suggest that based on your situation MVs are the right approach? I…
Not true at all. It ensures people get needed nutrients when they have shitty diets. It's not snakeoil at all.