Yup logic . That is what it is . The same kind of logic that brought us cop21 .The 8 people at the table are vaccinated and unmasked (while sitting). The servers may or may not be vaccinated and are masked. Assuming they are not, they are at greater risk of receiving covid than the patrons but patrons are vaccinated so less likely to transmit. The patrons are protected against them from the mask (although they also have a lesser chance of getting it and if they do a less serious strain). That is how I see it. It seems logical to me. Same way it works in Ontario too.