@agouzov Yup I took that all into account. I'm specifically taking about medium characters, no Reach, and still having your reaction.
I'm claiming that, at least in earlier patches, "threatened" was implemented incorrectly as having a radius larger than 5 feet. My archer, standing close (~7 feet) to a goblin that still has a reaction, could be threatened (attack at disadvantage), but could also freely walk away from the goblin without provoking an opportunity attack. Thus a rogue wouldn't get sneak attack because the archer isn't technically adjacent to the goblin.
That's my theory anyway. That Larian implemented sneak attack depending on true character adjacency (<5 feet), not the "threatened" condition.
