Object Scale was not taken into account. This lead to reports like T74247 where the user scaled the envelope distance and radii to the supposedly right values inthe viewport, but these were actually 'wrong' under the hood. Assigning weights from bone envelopes seemed like it would fail, but this code would actually take the armature scaling into account when checking envelope distance and weight. ref T74247 Maniphest Tasks: T74247 Differential Revision: https://developer.blender.org/D6964