I think this is also an example of bad default options. You should not have to setup a bug report form to get correct tagging. No one writes bugless code it should be a default option to have a bug report or a feature request. I understand the other fluff around separate queues but for something a large as GitHub good default options are really important.
That's absolutely a valid point. However, if Github would have set something like this as a default, there would be a lot of people who would complain about it being too opinionated. Being open first with many options to customize and "lock down" is probably a good compromise.