Trail magic can be located on a spectrum. Since Trail magic is a serendipitous experience on the Trail, you can find examples of it on the right portion of a spectrum where instances increase in random, dumb luck chance toward a theoretically perfect serendipitous experience. Serendipity is mostly value free, though planned instances occurring in the opposite end of the spectrum have negative outcomes.
Leaving a cooler of food on the Trail or creating a hiker feed at a road crossing may typify good intentions by generous people, but not only are they planned (not serendipitous), these efforts can unintentionally create long term negative consequences for the Trail culture and Trail environment.
Clearing fallen trees from the Trail (among the many other responsibilities of a volunteer Trail maintainer),
or starting a hiker-oriented business in a Trail town (both take careful planning), or witnessing an epiphany-inducing sunset (you could expect to see this on the A.T.) don’t meet the traditional definitions of Trail magic, but are elements that help make the A.T. experience so magical in a broader sense.