I still need to play Alyx, that'll still be the biggest factor in pushing me to get a VR headset when I do finally get one. Also one thing Half-Life 2 turning 20 shows is that video games have gotten to the point where even some 3D ones that are 20 years old hold up well enough visually to not look extremely outdated. It could be argued this was reached a couple years ago but Half-Life 2 really was something for 2004.