Historical Context

[LisaFaginDavis]

What you don't seem to see is that the language convergence came with the media of newspapers, radio, TV, and the naming of new achievements of the 18th-20th centuries.
But you are in the early 15th century. Travelling was quite different then. With luck you had an ox cart.
Maybe it helps to look around in history first.
Your explanations are therefore a bit thin and not acceptable to me.

Happens gladly

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There is quite a lot of evidence that people did travel widely throughout the Middle Ages, especially during the late Middle Ages and Renaissance. If you read new scholarship (e.g. Geraldine Heng's The Global Middle Ages, Sarah Davis-Secord's Global Medieval Contexts, or Matt Gabriele and David Perry's The Bright Ages), you will see that many of the widespread ideas about the period are not correct. Many women were literate. People traveled widely. Commerce flourished between Europe, Asia, and Africa. etc.