Introduced support for Multi-View , which is essential for VR. It allows the GPU to render to both eyes simultaneously rather than doing the work twice.
It is important to note that Shader Model 6 is not a static target. Microsoft has been releasing incremental updates that hardware vendors can adopt. shader model 6
SM6.0 redefined resource binding.
It allows for better code optimization, meaning shaders run faster on the hardware. Introduced support for Multi-View , which is essential
SM6.0 is supported on old hardware (Pre-GCN AMD, Pre-Kepler NVIDIA). However, all modern GPUs (NVIDIA Maxwell+, AMD Polaris+, Intel Gen9+) support it. Introduced support for Multi-View