Just recovered my password after a very long break, my account also almost makes it to those 20 years ;-).
After many people moved from low level DirectX and OpenGL stuff to game engines such as Unreal & Unity, a lot of the knowledge moved to different forums and sites. Also the reason why we have seen some many dev. sites disappear in the last decade. A lot of knowledge has been permanently lost in these cases too (Gaming Wiki, Lucky's VB, etc.). I wish GD.Net all the best to keep going on for a very long time, and that the knowledge will stay also available for many years to come! 😀