Yes, this is still relevant.
I am currently having this issue with 0.7.0. I have been importing 44.1kHz files (usually .mkv or .avi) and then trying to down-sample them to 16kHz in Audacity (which I think uses ffmpeg), before exporting to .wav. The results are middling to poor without down-sampling, but with down-sampling they’re nonsense.
I don’t know how related to this to importing and exporting, as the quality suffers more with down-sampling.