For what it's worth, here's what I took from Jack's information:
I can now look at racquets that are a comfortable swingweight, balance, grip size, head size, etc, for me personally, and then pick the most flexible one, which I find more comfortable. I can do this safely, in the knowledge that this is not affecting the power of the racquet greatly, aside from the odd time when I might hit from the tip or base of the stringbed. I've actually found the whole conversation quite liberating! Good luck with your racquet search.