It was me that introduced the phrase 'horses for courses' to the discussion. I just meant that conditions determine the best footwear for the job. Sandals or light trailrunners are fine for trekking in temperate climates on easy terrain and I use Tevas wherever possible to keep my feet cool and sweat free.
Boots are what you need in british mountain winters when you are scrambling up rock and descending scree slopes. Or walking all day through wet terrain in the english monsoon season. I find walking more than 15-20 miles with wet feet in lightweight trailshoes gives me sore feet, so I'm prepared to pay the weight penalty. I'm open to suggestions for some lighter goretex etc alternatives though, if they really do keep you dry and sweat free like good ol' leather.
The best ankle supports are strong tendons, good balance and if necessary a trekking pole. Overly tightened boots just cause more problems in my experience. Obviously for injuries like the one Alison has suffered, different strategies have to be adopted. T'ai chi practice improves range of movement and balance a lot.

