Personally, I find there is generally more going on socially on a Fri or Saturday so the footy's easier to fit in when it's Sunday. Of course, it's not great for some, but that's the way with every timeslot.
From an exposure POV Sunday's obviously not great, so a nice balance of timeslots would be ideal.
I'm pretty sure we've had a couple of twilight games in recent times - v Richmond and/or WB at TD last season iirc.
I also don't see what's great for fans - apart from the clock what's different? Fans don't seem to share your view since we get worse crowds than normal for twilight matches.
Personally, I find it's pretty inconvenient. I imagine it's not good for families with young kids, but for some it may be great. *shrug