Yes, to answer your first question, randori is a valued component of our training.
With regard to your second question, "How without real Atemi waza?" I blend with the attackers energy (yokomenuchi, tsuki, grap, ect.), control my oponents center, and redirct the attack using the uke's engery into a throw or hold. Throws have their value, especially when its into the next assailant! Holds can be of value as well, once you have an uke's center, you can control him at will, and you've got yourself an nice shield and a weapon.
Randori is far for complex then what I've described here. But, if the uke is truly trying to attack (as all good uke's should do!), they will "give" you their energy, accept it, use it, and you will never have to atemi again.
However, off the mat, with my life in danger, I would not know what my true budo would look like. My actions would depend on the attacks. Strikes do have value as however, they get people who don't know what they're doing on the ground in a hurry.
Honestly, on some of the inside (which are therefore more dangerous), Aikido does in fact require a physical atemi. So, Ueshiba was correct when he mentioned atemis of the physical variety (every Aikido move does require a ki atemi to be done correctly, whether you believe in ki or not). However, if you use an atemi on every move, how will you ever learn circles, softness, extension, sensitivity, and all of the other qualities that are inherant in training with the techniques correctly?
Thanks for reading!