Spoken language is also different in that, as you correctly point out, it is at times more limited in how much information it contains, but also, in other ways

Spoken language is also different in that, as you correctly point out, it is at times more limited in how much information it contains, but also, in other ways it can be much richer in information than the equivalent writing. Things like nonverbal or tonality can contain a lot of helpful or contextually-relevant information that cannot be found in writing. So writing and speaking, while having a lot of linguistic overlap, are just different beasts. (Ironically I think my grammar in this comment is not great, but FYI English is not my first language-- I'd appreciate a correction if appropriate)