I will not house my birds in less than 4 s.f./bird.
Me Three!Same here. I just don't see the need, don't feel it's fair, it's going to get messy so much faster, you have more potential for fighting, and sometimes there are situations where they have to stay inside for extended periods of time and who wants to be cooped up in an overcrowded situation?
Have used less over a winter or two and seen the stress related consequences.
If I had a snow and wind proof run, it would be a different story.
Have had to reduce my flock numbers to accommodate the space I have, that cannot be expanded. 16 birds in a 6x16 coop works well here.