Here I got thoroughly mired in my own hypotheses so I've deleted even the bits that I thought a bit interesting
Looking for further evidence, I came across the Wiki History of Latin which may just be the standard thinking which you're querying. But
"Surviving Latin literature consists almost entirely of Classical Latin in its broadest definition. It includes a polished and sometimes highly stylized literary language sometimes termed Golden Latin, which spans the 1st century BC and the early years of the 1st century AD. However, throughout the history of ancient Rome the spoken language differed in both grammar and vocabulary from that of literature, and is referred to as Vulgar Latin."
An essential point being that Vulgar Latin was not simply the language of the uneducated. And some of us write differently on this forum (no pun intended) from how we would write in a more formal context (cf Cicero's letters?). So the speech/written distinction begins eventually to blur - usually in favour of the speech forms.
(Yes Appendix Probi is only vocab but the phonology will affect grammatical forms in the same way)
Looking for further evidence, I came across the Wiki History of Latin which may just be the standard thinking which you're querying. But
"Surviving Latin literature consists almost entirely of Classical Latin in its broadest definition. It includes a polished and sometimes highly stylized literary language sometimes termed Golden Latin, which spans the 1st century BC and the early years of the 1st century AD. However, throughout the history of ancient Rome the spoken language differed in both grammar and vocabulary from that of literature, and is referred to as Vulgar Latin."
An essential point being that Vulgar Latin was not simply the language of the uneducated. And some of us write differently on this forum (no pun intended) from how we would write in a more formal context (cf Cicero's letters?). So the speech/written distinction begins eventually to blur - usually in favour of the speech forms.
(Yes Appendix Probi is only vocab but the phonology will affect grammatical forms in the same way)
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