I feel like that is a debate no one is going to win, and I have often wondered if the ones who want to argue the points are people who have found another religion that "really is the right one this time", or maybe they are still trying to prove to themselves it is the Truth™. I really don't know.
The point that you make is very interesting. The way I see it is that different people are at different stages of their lives, different stages of their sorting their own spiritual path, and to me that means that those debates matter to some degree.
I find id difficult to balance allowing people their own space to develop their own believes and putting up with a lot of nonsense. Where I find the most problems is that some people are still in JW mode, meaning that they go with the intent to convince others, not necessarily to listen what others have to say.
Also, I find it ok moving on from the debate and let others carry on. Just my thoughts.