A mediocre mic placed 3-6" from the mouth is going to almost always sound better than any price of mic placed 5' away, except in sound treated studios with excellent technique and strong post-processing.
Have you seen the movie This Is Spinal Tap? Good scene on this "common knowledge":
i'm not an audiophile either, but some videos really had audio that was terrible enough to make me quit that.
examples: some buzzing in the background, high-pitched noise in one of the channels, or audio in mono (you only hear the person talking from the right ear, for example).
This one has a good example of bad vocal audio (at 1:00): https://youtu.be/-PLMiA18tBc?t=60
Bad video as long as you can read everything on the screen is okay.
But poor audio is an absolute bummer. Cannot tolerate this at all.
This doesn't make rational sense to me. I think it is probably because people have access to decent audio for much longer time than they have had good video.
It's 100%. Even god himself needs thunder during a storm that has lightning.
(Or that's what I was told when I did some TV shows and how important the audio engineer on set was.)
Audio is 80% of video.
People will watch potato-quality video; no one will listen to garbage audio.