There's a reason to having to click the "quick reply". If you click "display modes", you'll get a drop down menu asking for linear, hybrid or threaded mode. The hybrid is between linear and threaded.
The point of the quick reply is that you need to click it if you are responding to a particular post (not thread). Notice each post has it's own quick reply button. When you click the quick reply button to a post (for example, to this post by me), in the threaded/hybrid mode, you'll see your reply being cascaded from this post.
So the quick reply is for responding to a post. If not responding to a post but generally to the thread, you should use the "post reply" button or quick reply to the first post. I realised not many realised this, and so the threaded mode appeared rojak.