There can be a lot of issues dealing with a full body. If you're burying it, you're going to be disturbing the soil possibly around existing trees because peopl

There can be a lot of issues dealing with a full body. If you're burying it, you're going to be disturbing the soil possibly around existing trees because people will want to be buried next to Giant trees. Unfortunately that's going to cause root system damage and a lot of those large trees actually have very shallow root systems. You can't just leave bodies on the surface because then you have all sorts of complications when people stumble across them. Even tagging or otherwise identifying left bodies has its own set of issues such as becoming an ideal way to dispose of a body - most likely it would be pretty easy to forge whatever identification would be left, and who's going to be making a practice of checking the papers of all the dead bodies found in the woods? Edit: forgot to factor in souvenir hunters who might want to collect whatever kind of durable token might be left in & around bodies left this way. Basically, what was practical 150+ years ago no longer is.