Yeah, headphones by definition are stereo, which is where the simulated aspect comes into play ![]()
You don’t need optical support to support a virtual surround sound though. My older turtlebeach PX24 and Playstation Golds supported surround sound. They both also offered a stereo mode where the surround sound was disabled.
As for telling the difference. It’s all trickery obviously but I’d be surprised if you didn’t tell the difference in scenes like the one linked below when switching from standard SS on a SS headset and then listening to the same audio using a stereo headset with Atmos enabled. Doesn’t sound like you have a headset with virtual surround sound, so I’m not sure if I’m able to help show my point there though.
At the end of the day, the head phone manufacturers aren’t all going to assume everyone has a format enabled on their xbox, so there are bound to still be gaming headsets that simulate surround sound without enabling those formats. It’s in this respect that I think Sony’s approach is probably the better of the two.