Hey, Brian. I agree very much about fitting and shaft differences.
Although I'm not a Titleist driver user (not yet anyway), I've seen and compared many shafts with each other. For me, the kick/flex point from the shaft was a big factor. Generally speaking, mid flex or kick got me the higher launch and gave more carry while the low end kick gave me the lower trajectory with less carry, but it has more run/roll on ground.
If I knew the course that I'll be playing would have hard and running fairways and nothing tricked up where i can't see, I don't mind playing with the low kick shaft, and vice versa. However, I regularly play the high launch and carry. (all relative to what I can produce, of course-- which isn't much at all.)
Now that I've written all that, I'm not sure it has any relevance to your topic. (just golf gabbing here.)