I have watched this before but can’t right now, and I think it might discuss this at the end if I recall, but always these systems seem to work amazingly in theory but in the real world break down because of families wanting to board together, people all not being ready and waiting at the gate, and the huge amount of effort (requiring more staff) and space it would actually take in the terminal to corral people in preparation of boarding…

It’s a fun thought experiment but it’s just one of those things where it seems there’s no ‘good’ solution that actually works in reality, but the less you try to organise it, the closer to a ‘least-worst’ situation you get…