What you say in the first part sounds correct, in that visibly sick people could be more likely to be aware of it and stay home or wear a mask than in other parts of the world, but don’t underestimate the pressure to conform. A maskless gathering will hardly have someone standing their ground wearing a mask, regardless (if one is visibly sick one will be unlikely to attend though).
If people here were more aware of the mechanics of spread and asymptomatic carriers, I think the high peaks could have been avoided.
As to ventilation, before it was officially banned many restaurants were already non-smoking. Add to that the incredibly fast churn of restaurants closing, opening and renovating, and you can see there’s no perceptible residue from that period. (I don’t observe particularly strong ventilation in Seoul restaurants or cafes, but to be fair I am mostly comparing to Hong Kong, not US.)
If people here were more aware of the mechanics of spread and asymptomatic carriers, I think the high peaks could have been avoided.
As to ventilation, before it was officially banned many restaurants were already non-smoking. Add to that the incredibly fast churn of restaurants closing, opening and renovating, and you can see there’s no perceptible residue from that period. (I don’t observe particularly strong ventilation in Seoul restaurants or cafes, but to be fair I am mostly comparing to Hong Kong, not US.)