Water and abrasion resistance and ankle support have been considered. However, my ankles are of no concern, i.e. they require no special attention other than providing them support so that in the future they don't become a problem.
Abrasion resistance and longevity and are of concern though.
I'm on the fence with regard to water resistance though. I have recently begun using Goretex socks, and have found them to be great, though they can produce a little friction on decent, however, a light pair of cotton socks put on first prevents this.
My usual area has a brutal and difficult 90min of accent to start with containing stream-creek and boggy area crossings. So leather boots become wet and heavy quickly and remain so for the remaining 5hour walk in. And I'm not prepared to carry another pair of boots as this negates the purpose of trying to cut down weight particularly for the accent. Another rationale re textile uppers is they tend to pump/flex themselves dry whilst walking.
It may appear that I'm trying to talk/convince myself into textile uppers, but into just laying out some of my rationale for others to follow and comment.
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