How would a “New Feature” category be different than “Development”?
As I understand it “Ideas” is a place to throw an idea out there for debate and see if there is a sense that the idea should be implemented. Your Date quality in GEDCOM exports seems to fit that category. The idea has been proposed, should we do it?
The PR #941 Age Stats is well underway and I see the “Development” would be where this would be discussed. Unless you see the Development category to be more on the technical side; more of the How-To.
I am not throwing water on the idea just entering the discourse.