The point is that everyone say that about their own language, I've encountered French, Dutch and Hungarian proclaiming their language is the hardest.

It's not properly hard until the verb system has all the necessities to fluently express every time-travel scenario. Also known as HG-hard. Most languages can only describe time-travel scenarios using related concepts - this is called HG-complete.

well, I guess some grammar is crucial to intelligibility, not necessarily the prescriptive grammar. When a lot of people make the same mistakes, they share a new code, new intelligibility expectations, a new grammar.

I think many people forget that when talking about how the newest generation mistreat their language, or whether foreigner's mistakes can be understood.

heck, sometimes it's funny when a native speaker tells me that I speak X very well (I don't), just because I use some prescriptive form correctly.