Yes, both are me. Welcome to The Lightweight Backpacker!

I resisted the switch to trail runners for years, thinking the same as you about ankle support. Finally I had to switch--I could no longer find women's boots that weren't Goretex lined. Goretex turns my feet into a sauna, and takes days to dry if the boots get wet inside.

I used to turn my ankles any number of times in boots. To my great surprise, in my first pair of trail runners (Montrail Hardrocks, long since discontinued), I tried really hard to turn my ankles on purpose but couldn't. I haven't had an ankle-turning episode since I switched! It's actually the footbed of the shoe that provides the ankle support, not that little bit of leather (or padded nylon) around your ankle.