What problem does this solve or what need does it fill?

Some GPU features (SM6+) require DXC, which is not the default DX12 shader compiler. Even if your GPU should support them, some features might be reported as not available, which is confusing.

What solution would you like?

Log whether the app is using FXC or DXC at startup, and the max supported shader model.

Additional context

I was trying to run my app through a debugger, and was confused why it was telling me some features were not supported. I had forgotten to copy DXC to the target directory of my app, so it was silently using FXC.