> I think most of the claims about grammar are false.

This part about "forced the English plural We [..] injecting mandatory number-specificity where context once sufficed" really struck me. Sounds cool for poetry to be ambiguous about this, but really now, how is an advanced society handling the practical matters of writing contracts and keeping records without it

> how is an advanced society handling the practical matters of writing contracts and keeping records without it

By "it" I guess you mean grammatical plurals? It's indeed semantically redundant. Say in a context of contracts, how is "3000.00 dollar" in any way more ambiguous than "3000.00 dollars"? The Chinese language indeed has been supporting an advanced society without grammatical plurals for thousands of years.