> And what about the vocabulary? Why does the site I linked to
> provide an on-line glossary if it's all so perfectly
If you are thinking that Harper or I are arguing that no change in vocab occurs over time, then you are arguing with a straw man. Vocabulary does change over time and between place. Vocabulary is a product of chance and circumstance.
I imagine a medieval society had many words for things of import to them for which we have few or none, as those items and concerns no longer have import for us. Likewise, it would be fruitless to search the archives for the Middle-English translation of "computer." In Newfoundland, there's probably 50 words for simply varieties of Cod Fish for which you recognize only the one.
> Why does the site I linked to provide an on-line glossary
> if it's all so perfectly comprehensible?
This glossary makes about as much sense as a "Teach yourself to speak the Newfoundland dialect" lesson plan one might find in a book of "Newfie Jokes!" The very idea of teaching pronounciation is a complete fabrication!!! As though they can be assured that English was pronounced with any consistency from one county to another!
I can tell you that in Newfoundland, two communities seperated only by a harbour speak forms of English that are as distinct in pronounciation (and voabulary) as Caucerian English is to Modern English.
In Newfoundland, we laughingly refer to our collective dialect as "Newfun-ese." What seperates us from English linguists is that we at least know that we are joking!