> Or just keep using protobuf2, 'cause it's been working great for us for ~6 years. Oh sure, I wouldn't change practices, but I'd certain question why that pra

> Or just keep using protobuf2, 'cause it's been working great for us for ~6 years. Oh sure, I wouldn't change practices, but I'd certain question why that practice had been put in place. > That only works up until there's no "reasonable default". If there is no reasonable default, I'd be even more wary about making it a required field.