Agreed. For every foo.stackexchange.com there is already a meta.foo.stackexchange.com and a chat.foo.stackexchange.com. Why not add idle.foo.stackexchange.com

Agreed. For every foo.stackexchange.com there is already a meta.foo.stackexchange.com and a chat.foo.stackexchange.com. Why not add idle.foo.stackexchange.com to the mix?