It’s impossible to get a priority list right for everybody - it’s too easy to say X isn’t working so why work on Y, but often it’s a lot more complicated than that, maybe Y impacts more than X or X has dependencies A, B and C which need to be done first, or simply the resource to do X is busy with Z.
As it happens the DX12U update brings with it a new audience to MSFS, improved performance and no doubt many improvements to usability and bug fixes so that sounds like a higher priority to me. 