Sometimes it takes little reminders like that to show us how far we've actually progressed. I think I've been managing to extend my range (that is, keeping fairly close to my 'old' voice) because I still default to my 'customer service voice' at work, which helps me keep my feminine range. But when I play around to see how far down I can drop, I tend to surprise myself with the bassier tones and resonance that I'm achieving. Haven't got any before & now footage to compare, as I've never been fond of being recorded, but when I pay attention and push a little, I hear a distinct change.