The OS/hardware though, has serious limitations that while no problem for me, definitely pisses off people. Examples:
No atomics/Thread local support. Doesn't matter that someone ported GCC 15 -- you can't make use of many useful newer language features.
Immediate Mode OpenGL only. There's no direct hardware access. Not a problem for me, but every SGI out there is fixed function only. I've had people bitch to high hell we don't have shaders.
and in general, some people just think the OS is janky. I love it, but not everyone is me.