Probably not. Most of our words are content words, and the near-duplicates are, as you say, the result of borrowing from various other languages. These words d

Probably not. Most of our words are content words, and the near-duplicates are, as you say, the result of borrowing from various other languages. These words don't serve a grammatical role and we could make do without them just fine. The words that serve to replace grammatical features that exist in other Indo-European languages are a very small subset of our words—words like "will", "may" the prepositions, and similar. Non-natives will reach for other words to substitute for these grammar words when they're unsure which grammar word to use, but I don't think that's why those other words exist.