Better integrated voice regognition
In the windows 98 days we had great voice recognition for VR gameplay via Microsoft Sidewinder Game Voice. There were a lot of keyboard commands in most games of that era before Windows became more controller friendly. A good game voice profile really makes those games as real as it gets. A few strategy games, I was able to play with voice control alone without any other input. There were more things to be done on those games because the number of required input events, were not limited to the buttons on an X-box or 2 touch controllers. I still have my old Z800 HMD, Game Voice and an old PC with those great old games installed. In some ways, VR has come along way in 20 years, in many ways. In my opinion, voice recognition and macro input ability, is as important as good 3D for a good virtual reality experience that makes you feel part of the game.