Earlier quoted context omitted.
Put physical dividers in the overhead bins so that oversize luggage won't fit at all and has to be gate-checked.
The main disadvantages are that physical dividers add weight and require maintenance. Also, they reduce flexibility, preventing the ability to tetris more bags into a bin.
Re: Why is boarding a plane still a mess?
#11Sure, but I suspect that the savings in reduced turnaround times could be enough to offset those things.