Why the sounds does not wok properly, there is no sense of stereo sound. Walls and other object no longer prevent sound barrier?! Why?!
That functionality was removed due to it being processor intensive; it made the visuals suffer for the sake of a seldom used audio.
But I agree with you: stereo/directional sound should be a standard (personally I don’t think it’s quite as important to have barriers to the sound)
As mentioned by @Gadget_1 , this is by design, but if you like, I can happily file a feature request to revert these changes accordingly, or to let you choose what you’d prefer in this case. 