This is the single dumbest thing SW does. Make them sit in the back and no one will preboard unless they absolutely need to. No other airline has 10 people in wheelchairs, 15 families, and and 5 random people with "medical issues" that get to board before everyone on every flight. A30 might as well be C at this point.

Board these people first if you must but put them in the last 10 rows.