The second half of the article is the interesting one. Skip/skim past the "do you have a ceiling" bit. The meat is the idea that if you go too long with a miss

The second half of the article is the interesting one. Skip/skim past the "do you have a ceiling" bit. The meat is the idea that if you go too long with a missing bit of understanding, the workarounds and coping strategies you form to keep progressing can create a barrier which is not remedied by filling in the original missing bit.