Ok, let's think of an instance when the 'quote' function is removed. ...
I've quote appropriate text forever without a "quote" feature. It's not at all a necessity, but merely a convenience and like many or most conveniences it becomes misused simpy because it's convenient.
It should be fairly obvious if the quote is cropped judiciously.
If, on the other hand, you're referring to post #5 in a thread with, say, 120 responses, you'd need to add a little more.