Yes. Let’s just get that out of the way. You can’t walk within twice the radius or drip line of a tree without compressing the soil where its roots are trying to absorb nutrients from the air pockets that used to be there before you compressed it. Digging holes or using pin foundations (for posts to support the treehouse from the ground) cuts some of the small absorbing roots, even when no big roots are cut. Drilling holes into trees to install tree house fasteners hurts trees. Treehouses are not natural and I have never seen a tree house that did not at least temporarily cause the tree some amount of stress.
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