-Advantage in melee by beeing behind the target has been taken out due to feedback. Dispite it beeing a literal interpretation from the rules. (you get advantage if your target cant see you attacking)
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On page 194 the unseen attackers and targets section states that if your opponent cannot see you, you have advantage when you attack them. If someone is standing behind you, you cant see it. Hence why moving behind enemies became instant advantage which completly broke combat.
Most groups run the rule that unless someone is hidden when combat starts then everyone at least knows of your presence even if they cant see you directly. I run it the same as well but technicly thats a house rule and not true to the phb. Its completly broken to run it as written though as it just turns into people running behind enemies and having perpetual advantage which I really doubt was the intention.
The PHB, p194-195, indeed says "
Combatants often try to escape their foes' notice by hiding, casting the Invisibility spell, or lurking in darkness. When a creature can't see you, you have Advantage on Attack Rolls against it". But on p177, the box on Hiding says "
In combat, most creatures stay alert for signs of danger all around. So if you come out of hiding and approach a creature, it usually sees you" (the emphasis is mine). And on p192 it says that "
If you succeed [at Hiding], you gain certain benefits, as described in 'Unseen Attackers and Targets' section later in this chapter".
I don't think there is any point in the PHB where it is implied that creatures have some sort of vision cone (and thus a non-vision cone) and that by merely standing/walking behind an enemy, you are considered unseen by them. In fact, it seems pretty much clearly implied that some sort of effort or preparation is required to be unseen and to remain unseen.
I would add that in the DMG, p252, there is an optional rule called Facing. Using this rule, it is explicitly said that when you are in the rear cone of a creature (non-vision cone of angle 90°, as defined in that section), you are unseen and attack with Advantage. However it also says that a creature can change its facing as a Reaction to another creature's move. So, if you just walk around the enemy ... they are going to rotate to keep facing you. Which is very sensible, unlike what BG3 was doing.
I very much share your doubt about the intentions. But I don't think the rules (as written) are broken in any way, and I don't think that what you're doing is a house rule.
