I highly recommend any user using Whisper obtain an official transcript or text-based copy of the materials they put through the Whisper transcription feature especially if they’re a beginner in that language.
Advanced users might be able to more easily draw on their vocabulary to correct errors in transcripts produced by LingQ’s Whisper feature. Still, as mchipp points out, this is likely to be a frustrating roadblock to beginners if they overlook the mistakes produced by the Whisper transcription.
And some materials (as Mycroft points out) don’t have any written source material available, so in those cases, it is “the best we have.” Still, beginners should use that Whisper-generated material, knowing it could be full of mistakes.
Whisper is definitely far from a “plug-and-play” type feature.
P.S. nfera provides a useful chart on this feature here: