I must say, I think GM4Him's suggestion, i.e. not displaying the vision cones, isn't that bad. It would introduce a bit more challenge in sneaking, thus making sneaking a bit less easy (and by "easy" I mean essentially given for free so long as you bother clicking the Sneak button ... maybe I should have said "broken").
But it still wouldn't make sneaking challenging either. Even if I don't know exactly where the vision cone starts and stop (in terms of width/angle as well as length), I know the that half-disc behind an enemy's back isn't covered. To me, it sounds like Larian's attempts to make the chain system less bad instead of revising it in full.
Here are two major issues with stealth currently, that merely removing the display of the vision cones would not solve.
1) Sounds.
It seems that the game does not know about sounds. You can wear noisy metal armour, heavy metal boots and dash in the back of an enemy, without problem.
Vision is one thing. But people have more senses than just vision, and can detect your presence if you're noisy. So long as the stealth system doesn't take sounds into account, it will remain ridiculously poor, in my opinion.
2) 100% player skill.
Currently, a character with 8 Dexterity, no Stealth proficiency, and wearing armour that gives Disadvantage on Stealth checks, is just as good at sneaking as a character with 16 Dexterity, proficiency in the Stealth skill and wearing appropriate armour. Because you (I mean, your character) only ever need a Stealth roll if you pass through a vision cone.
So if you, the player, has enough skill to avoid your character being in a vision cone (and that's easy), you are guaranteed to succeed.
Removing the display of vision cones would only increase the difficulty in terms of player skill, but it would not change the fact that your character's "build" does not matter.
I'm not saying no to the whole idea. If, upon release, that's the only improvement available for the stealth system, I would quite probably activate "hide vision cones" (assuming it's an option). But it's really a minimal improvement to me. I'd prefer it if Larian acknowledged that their current stealth system is massively underwhelming and put some serious effort into it.
