@swbca - I previously had the D3 Blackout Leverage and just this season switched to the T-Factor. 6 sets in and I really like it. I haven't tried really yanking on the laces as tight as they'll go, but I've sinched them quite tight, and at the end I've still been able to pop my foot out about the same as my old Leverage. It's maybe a little bit tighter than the Leverage, but not by much, and the Leverage always released really easy in falls, so I'd predict the T-Factor is the same safety-wise. And if you are nervous about it, you can always not tighten the laces as much!
I'm a beginner and have never had a hard shell, but I read a lot of BoS lol, and it seems to me that unless you're a really advanced skier looking for that little bit of extra competitive edge, and are willing to spend dedicated time maintaining and even modifying your boot, hard shells aren't worth the hassle, risk, and cost. Again basing on what I've read here, the T-Factor is still an exceptional boot, without any of the potential drawbacks of hardshells. Personally, I don't plan on changing from the T-Factor for quite a long time.