I personally prefer a global 0027, but I've heard arguments for 0077.
I also did a quick web search and found wiki pages meant to discuss the default. I imagine the most helpful course of action would be to read through the existing discussions and then contribute facts that haven't been shared... ideally without the emotions and opinions present here.
I never read anywhere that a form decision was made, just that there hasn't been cause for change.
My preference of 0027 doesn't make sense for the typical family. Their default doesn't make sense for me.
I got the impression this was never changed was because people that care can do a search for how to change it, change it, and no longer care. I use configuration management to set it and haven't thought about it again.