Then I bought a 3DFx Voodoo card and started using Glide and it was night and day. I had something up the first day and every day thereafter it seemed to get more and more capable. That was a lot of fun.
In my opinion, Direct X was what killed it most. OpenGL was well supported on the Voodoo cards and Microsoft was determined to kill anyone using OpenGL (which they didn't control) to program games if they could. After about 5 years (Direct X 7 or 8) it had reached feature parity but long before that the "co marketing" dollars Microsoft used to enforce their monopoly had done most of the work.
Sigh.
I don't know the details myself but as a FYI... this famous answer covering the OpenGL vs DirectX history from StackExchange disagrees with your opinion and says OpenGL didn't keep up (ARB committee). It also mentions that the OpenGL implementation in Voodoo cards was incomplete and only enough to run Quake:
https://softwareengineering.stackexchange.com/questions/6054...
The author of that answer is active on HN so maybe he'll chime in.