I suggest that you broaden your horizon before you go ranting. You wouldn't make a fool of yourself.
First, that card doesn't work well with *any* Linux drivers, open source or not. Even their Catalyst driver is horrible in Linux.
Second, OpenGL in Linux is much more important for the professionals than gamers - large portion of virtual reality image generators (machines that render the landscapes, vehicles etc. depending on the instructions from the simulation system) used by all sorts of simulators (military, flight, driving, etc.) run Linux, because it is much easier to develop for, to keep it stable and the latest bells and whistles are not required.
Unfortunately, thanks to the boneheaded AMD management that had only a *single* developer working on Linux drivers (it used to be that way, maybe it has changed since then) and their poor OpenGL performance, driver stability (and bugs!) this is pretty much an Nvidia market now.
The same story for CAD and 3D modelling in Linux - again an Nvidia market.
So saying that this is somehow acceptable, because you are not playing games is really not helpful.