Exactly. If you're in an area with Grade 1 trees you won't find Grade 2 or higher in the same area. Once you change area (not zone) you get a different grade or none at all.
I didn't notice the loot change in nodes but it's good anyway. Less missed shots because I'm not lucky enough to hit the item on the first swing out of two.
They do need to make gathering a bit less random imo but for now it works.
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