Coming on A Jetplane 4

What do you need to do when you want to board an airplane?
Ok, first you need to get into a passenger-only area where you need to show your ticket and passport. Then after that you again have to enter another area, the immigration clearance area, by showing your passport and ticket (at this time they call it a boarding pass) so that you can wait for your boarding time. Then, after you realized that you are late because you are too busy trying many fragrances at Duty-Free shops, you the rush to an even smaller room, again by showing your ticket and passport. But it’s not your plane yet. You still need to wait in that room for a while, until the officers open a door for you to go into a very small and tight area where you cannot walk side by side with your wife because there is not enough space, and you need to sit on a chair that is designed for men the size of Barbie dolls.
And guess what, that last area is your plane cabin, where you need to stay for at least 90 minutes before you either arrive at your destination, or feel numb on your legs.

So the question is, why do we need to go into many different areas? With each getting smaller and has less facilities. Can they (again, I don’t know who “they” is) streamline the process so that we only need to show our passport and ticket once and they just give us a seat, chop our passport and throw us directly into the miserable seat?
Is there any reason they put us into long queues over and over again like that, aside from the fact that they hate us? I know that they would say that each queue and area has different function and purpose that cannot be combined; otherwise the whole airline business will collapse and the evil Mordru will escape from the airport evil underworld, but can they at least make the life of passengers easier by, I don’t know, taking away one of the waiting room? The last room before boarding the plane would be one good choice. But I don’t know whether it is feasible for them. I mean, they are the same people who think airline food tastes good. So, we’ll see.