"Firstly, no need to zing me for a simple mistype." Why not? You strike such a pretentious air, but then write hilarious stuff like that!"...the point you are eliding is that spoken language AS IT NOW EXISTS is in fact inextricable from writing." No, it's not. The vast bulk of first-language acquisition happens before a child even comes across the written language. Check out first-language acquisition research."Here's an easy example: many/most medical terms in English are from Latin. This is from writing and educational systems, not from natural language." And (I don't know how you are missing this basic fact) t*he vast majority of native speakers cannot use most medical terms correctly*. In fact, most of us go to professionals who literally spend years if not decades in school in order to master said vocabulary. That literally proves my point: that a highly-specialized professional vocabulary (i.e., a jargon) is not natural language. Medical terminology requires an understanding of medical science, just as mastery of the terms of quantum mechanics requires a complex understanding of mathematics and physics. A florist has hundreds of terms for hues and species of flowers and shapes, but none of this is understandable to the layperson who doesn't know anything about flowers. A complex, specialized vocabulary--a jargon--is learned with the skills they are part of. Most of natural language is not bound to a skill.
And learning jargon is tied up with learning a technology, such as writing, medical science, etc. This has to be explicitly learned. Natural language, including a lot of second-language acquisition (especially speaking), does not require explicit learning. A great deal of it is implicitly learned. (Which is why Chomsky coined the term 'acquisition' as opposed to 'learning'.)
"In addition, the computer (and now smart phone) revolution is in fact influencing the way people compose language both spoken and written. What is different here is not natural language expressing itself but a new means of communication that changes how messages are constructed. These effects are self-evident." On the contrary, what these technologies are showing is how natural language enfolds in real time. They're simply allowing us to record new words as they emerge, but they are not changing language in any fundamental means. Read Because Internet to see the a good book (and not post-modern drivel) on this: https://www.amazon.com/Because-Internet-Understanding-Rules-Language-ebook/dp/B076GNS3J4/ref=sr_1_2?dchild=1&keywords=because+internet&qid=1596225285&sr=8-2
"McLuhan, Chomsky, and Wittgenstein have more to say on this then Derrida in my opinion." That's interesting, because my position is identical with Chomsky's on this topic.