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hippy-
I honestly can't remember a single dropped chain in about a decade of TTing on 1×n (for n>1), although I'm pretty sure my dad dropped a chain at least once between 1969 and whenever he got a front dérailleur, i.e. about 2006. In the olden days, all the chainring teeth were full-sized, we didn't have reduced teeth at the shift points, but we did have bushingless chains from about the mid 70s (thanks SEDIS) and even shorter chainstays than modern bikes.
gbj_tester
Of course, we all used to use single chainrings in the olden days without recourse to any gadgetry, and you'd have thought that somebody would have tried to flog us something over that half century if dropping chains in TTs was really an issue.