One problem is with modern programming technology which allows for 'automatic' voice-to-text conversion and spell checking which may either allow the wrong word or change a word for the worse. If no one competent is minding the editing, 'cock-ups' (some programs wouldn't allow THAT) can easily occur. ... and it's getting harder to find younger proof readers and editors who ARE competent - they just assume the program knows.
(I have slight hearing loss, and occasionally use closed-caption for some TV programs. There are some startling errors and very funny reading when no one is minding the banners.)