I also I never said I prefer the convenience over the privacy. Here is a tip, just because you hold a viewpoint does not mean it is infallible. There ae trade offs. While personally I am scurity and privacy conscious, I was pointing out the barrier for people to opt out, that is all. There is no two ways about it, unless there are a ratoo of 1:1 staff to passengers who opt out there will be a queue. The machines were put in in massive volume far exceeding the number of staff that would ever be checking people through in order to speed up the experience and due to them costing less to run.
I agree with you. You can still be objective and recognise the situation for what it is. A barrier to opting out is the likelihood that the manual check through takes more time. It doesnt have to be significantly more time.