Meanwhile FR can board a plane with 2 agents on the gate rather than BAs 4.

The gates are slower when people don't know what they are doing, provided the agent has checked the passports while people Q.

At FRA LH have a desk at the gate for a passport check. You get a piece of paper that you can then show when you are boarding, and you are ticked of the seating passenger list as checked. So a lot of the checks are done before boarding starts and its more 'foolproof' than BAs method