It has been said before, but it bears repeating: non-exclusive nodes for crafting materials are a great design decision for cooperative play. We can both harvest from the same tree, rock, or carrot. It takes away racing, avoids enmity between players, and keeps goldfarmers from timing respawns and monopolizing spawns.
If xp per monster is non-rivalrous, why should materials per node be?
: Zubon
ALSO: In the WvWvW zones, the resource nodes are always level-appropriate to your character!
I don’t believe this is true. I’ve gathered mats above and below my level in WvW.