Its also incredibly hard to catch erors in you own writing. Skilled writres are usually good readers, and we have mnay silkls to dcpoyher txet, often with out noticeing.

(Errors introduced deliberately to illustrate.)

There's a reason virtually all books make it to print with errors. It's very hard to catch all errors.

It's also a fantastic use case for LLMs, since the structure of language is the exact type of low-hanging task LLMs are actually good at, even with cheap/fast models.