That approach works if you mostly see the word written, rather than hear it spoken. If you spend most of your time immersed in text and not much time immersed

That approach works if you mostly see the word written, rather than hear it spoken. If you spend most of your time immersed in text and not much time immersed in speech, you might develop a bias towards thinking the written word is the primary form. For “fsck” you could make a case that it comes from a primarily written culture.