I think lots of folks have been flying only glass cockpits where this is normally a thing, which is understandible.
A localizer antenna carries with it no course information at all. Before the glass cockpit days, steam gauge CDIs did not automatically slew to the correct ILS course, because there was no radio information that gave them that course. However, just like the old manual CDI days, it does not matter at all which direction the needle is pointed: that’s for pilot information. You can point the CDI 180 degrees completely backwards from the course and it will still be flown by the autopilot all the way down, because it flies the antenna signal. A localizer is not like a VOR in this way.
At the moment, we do not have auto-slew of the CDI implemented. In the Garmins, when you tune a LOC or ILS, it will look up the course in its nav database and initially slew the CDI needle to the database course. This is not required to fly the ILS properly, but does give the right picture to the pilot. We will be implementing CDI auto-slewing, but just haven’t yet.
-Matt | Working Title