All good points Andy that make theoretical sense to me. You do wonder why matey has recoded front 21s failing - could be less tyre mass to absorb impacts (compared to a chunkier rear) and longer spokes like you say. But the only spokes I've ever broken were on the rear which takes much more load in an overland rather than racing scenario.
I do wonder about the loss of spoke-tensioning/repairing ability with the 3M method. May be fine on some fat highway cruiser but we're all about crap roads in poor countries and off roading with big loads. For years I always fitted my bikes with HD spokes on decent rims (if necessary) but on the last trip a custom HD re-spoke made things worse on mine (the other bikes - same models & load - had no breakages).
This is why for real world overlanding I think I might prefer the Tubliss liners - they are easy to reverse.
Ch
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