Yeah, Randori is like that. I agree, most dojos need to do more. However, with the teaching methodologies employed in aikido at the range it typically is trained at....doing more randori isn't necessarily going to help a whole lot until you get the basics down. Hence, why you probably don't see much of it.
The problem is that, from an Aikido perspective, once it fails, you end up in the clinch, then it enters into a whole nother realm or spectrum of jiu jitsu training. Most dojos typically will break it up at that point and reset...then reach the conclusion that it is contrary or harmful to the things they are trying to train. that may or may not be true, but it depends on what you are training.
I have always wondered why we insist that only one aspect of Jitsu is allowed in rondori. In a battle, I bring a rifle, pistol and hand grenade. Why not allow aiki-no-jitsu, aikijujitsu, and Jujitsu in rondori?
Just me thinking out loud (and of course doing it as such with my friends and training partners)....