The seats are assigned. People have been standing in line for 15 minutes now. Why on earth would anyone want to stand there, when they could just sit and wait until the line clears?
I understand wanting to get off a plane ASAP, but boarding? You just end up sitting on the plane, waiting for everyone else to get on.
The nice thing if you ever fly first class is that you’ll typically get boarding priority and sometimes even your own door on larger planes so that you don’t have to interact with the poors (j/k I’m a poor too, I’ve just booked first/business class before when I have enough points saved up so that it’s worth it).