Hard headed is what he means. All he is trying to say is that you keep pushing for stuff that is not a simple code fix and is quite time consuming, a game engine has its limits and we have started to reach them.
I'm not hard headed. I just like to see more. There's always room to improve. Yes there's limits but I think we haven't reached them just yet. Besides you just do get anything in life by just doing something once and if it doesn't work out then quit. Sometimes we have to fight and keep trying. I never quit or give up for I'm willing to do whatever it takes to get what I want. And if we can't get the realistic crashes then so be it. But I'd love for DPU's, EOT's, the bell to only ring in one engine instead of all of them. Also I'd like to see the weaving cars go away and not keep going across the plate. Those are bugs we can't ignore. It wasn't an issue in the earlier games but now all of a sudden it's becoming common.