I think I can safely say that bad luck is the cause rather than poor line choice or riding in the woods generally! I’ve been riding for eighteen years and never broke a mech in any of the first seventeen of those!
I’m worried that getting a super burly mech may mean that if I get unlucky enough to have a stick in the spokes again I may ruin a wheel instead of a mech. I can always get home with a temporary singlespeed bodge but with no rear wheel I’d be walking, carrying and crying.
I’m going with a new Saint unit and fix it on with breakaway bolt, plus an old Deore in the backpack on long or inclement rides!
Thank you peoples for all the input.