I think the faster block times help with conceivably making it possible to use 1 confirmation instead of 0 confirmations for in-person transactions, as opposed

I think the faster block times help with conceivably making it possible to use 1 confirmation instead of 0 confirmations for in-person transactions, as opposed to than 60 instead of 6. That tilts the odds of winning in a double-spend fraud attempt in favor of the merchant quite a bit, compared to 0 confirmations, although I don't know how to model by how much. (You could empirically estimate by how much by looking at abandoned chain history in a real network, though.)