I picked up the game again after leaving it for few weeks and I start the mission in East Anglia to kill guards at Dunwich so Oswald can talk to Rued. Sure enough, I put on my stealthiest gear and I approach the area while crouched, only for a guard looking in a completely different direction several floors up on the castle walls to spot me, instantly, no build up or chance to react, and the ability which triggers slow motion and a chance to kill the guy is rendered useless because his head is actually behind the edge of the wall from where I'm stood, so he didn't even have line of sight on me. Anyways a violent axe massacre ensues which was very #Likeaviking but not very Assassin's Creed.
This is just one of many, many examples throughout my playthrough of being instantly spotted from across fields, by guards not looking at me or even through walls. There's many examples of this online too such as here:
The comments also full of examples of stealth players frustrated with the game.
Yet when I look at the known issues page there's no reference to glitchy stealth AI or instant detection (even on the easiest stealth difficulty I might add)
Are there no plans at all to address this? And if not, why not?