Earlier quoted context omitted.
Final aircraft assigned to the flight can be changed until the last minute. The info is most useful when booking. Presumably people might switch if the price/schedule is reasonably close while very few would turn away at the gate if they discover a max (I sure wouldn’t and I belong to the tiny minority that even think about aircraft models ever). So the info is most useful when booking. Flying an airline that doesn’t…
If they change the model of the aircraft at the last second, they should allow a seat change to no longer sit next to the door
They tend to be sold at a premium these days due to slightly more legroom.