Kady does a very good job of parsing the difficulties that can arise out of current forms of trail magic. He interviews numerous hikers, as well as the ATC's Laurie Potteiger and NPS's Rita Hennessy (both based in Harpers Ferry).
The drawbacks of trail magic? They include folks hauling all kinds of gear into otherwise pristine, primitive areas simply to provide a big feed to a crowd (kind of dents the wilderness experience for many), the trash that can be left behind where unattended magic is left trailside, people who might try to exploit the concept, and "reports of too much trail magic in the form of alcohol or drugs being provided at some events."
One thing's for sure:
"'(Hiking the trail) has become much more of a social experience,' Hennessy says. 'The thru-hikers that I know who did it 20 years ago had a much different experience than now.'"That's highlighted by the experience of one of the hikers interviewed for the story who has caught up with a group of hikers who started a month before he did, but make a point of stopping for any and every party - or hint of a party - along the way. That's maybe a different issue, but the party hardy attitude is fostered by planned, organized "trail magic."