Is room size considered when they design speakers?


Never see speakers saying best used in a 15 x 15 room.   
Also, why do speaker cabinets tend to be larger as they get more expensive? Not easy to answer. I know bigger handles bigger drivers but is this the only reason?
emergingsoul
I am not sure how they go about sizes, but they do not seem to care as much about speaker placement and room treatments as Audiogon crowd does...

Loudspeakers by DALI - Award-winning Hi-Fi speakers (dali-speakers.com)

Wilson Audio - SabrinaX
I am of mind to say larger speaker size should get along with smaller and larger living type rooms.  SQ in a smaller room can readily handle a larger high end speaker.  
I don’t want to know sound is coming from speakers.  Larger speakers do better filling room. Secret is to get speakers away from walls, and smaller rooms limit this.  Just want sound to fill room, hate dealing with sweet spot issues. 
in fairness, this is not universal.  Scansonic literally offers guidance to us and to consumers on what type of room to use each speaker in and as you rise in their line, the recommended room size increases.  

I am sure there are others, but this one in particular springs to mind.  

As a speaker maker, I don't want to "limit" who will buy my speakers but in the same token, if someone comes to me and says they want to use my speakers in a small room, up against the wall, I am going to tell them explicitly not to buy them.  All its going to do is make them unhappy.