@pingviini @kaia This narrative operates on the assumptions that:
1) the peoples of Europe would organically unite into a single mixed culture with a single language, which is contrary to what they have done over the last 5000 years whenever left to their own devices, even within the same country (Germany required an authoritarian push by the federal government to unify dialects, France was the same)
2) the idea that feudal fiefdoms and their rulers were outsider factors, and not born out of the same peoples they ruled, which happened a few times, but not in most cases. Especially in the Germanic regions, feudal lords and kings were often elected, directly by the population until well into the middle ages, and by elector counts and dukes in the late period.

The political and cultural divisions of the continent are the very opposite of artificial, it's the natural progression of humanity. The logistics to unify continent-scale populations are impossible without complicated political structures and statecraft, which do not happen in a "natural" environment (where people organize at the clan/town level, because that's the amount of people they can have personal connections with)

The absorption of loanwords and conversion of their phonetics and writing to naturalize them as part of the language is normal and natural, but generally happens to obtain words for concepts that aren't already present in the main language (See: robot, as a common example), not to replace existing, functional words.