link_to_authorpage=false: Because the link is in conflict with the polylang plugin (our site is multilingual)
user_link=website: Is best that the profile page becouse the site will be a planet and is more logic go to the website of the author but the author need put his URL in his profile conf
show_name=true: The avatar and the name :)
show_biography=false: Have a presentation problem and is no nice write another presentation (in multiple languages) or see some people with presentation and others without.
order=random: Very, very nice, I think that everybody understand why.
We are humans, be part of the group is important, very important and is very nice when the group show your picture in the members list :P