Again you are straying off point. This thread is about boarding. I'll address your points though. Economy comfort is decent, but the whole boarding process disaster for silvers makes Econ comfort undesirable. Ie, all the space in the bin will be gone when I board.

Upgrades? Yeah you must be kidding. Maybe on Saturday night out of east bumble.

I'm not sure segment flyers cost the airline more. Connecting flyers I'm sure do cost more