I've been climbing and backpacking in leather boots with exposed threads since the mid 1970's... I'm brutal on boots. I've slowly over years had stitching become abraded and lost a row or two in a small area, but that never affected the boots performance.
I'm honestly having a tough time trying to visualize anyone harder on boots than me... I'm one to avoid unnecessary stitching on a boot, but in general, looking over the Hanwag, I'd say they've been fairly restrained with excessive stitching (unlike what one sees on some Meindel models).
Just my perspective...
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