Honestly, I can't believe you can't queue for regular warzones with 8 people. To do the same with rateds would just be ridiculous. Literally, laugh-out-loud ridiculous.
"Hey, we see you've got 3 buddies with you, you've worked on gear and strategies and communication so that you are the best competitive pvpers you can be. But hey, just to mix things up, here's 4 totally random players who may or may not need to remove their hand from their mouse periodically to wipe the drool from their chins. Have fun!"
Can't imagine that people who have the option to pvp in a full group are gonna put up with that. Allowing people to queue with fewer than 8 is fine, but not giving the option to queue with a full 8 is a terrible idea.