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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.
Is it not an issue? I want to go single ring but worry about unshipping the chain mid race.