The defensive tactics that are available in Aikido's curriculum surely aren't a function of which techniques you know. In fact I would go so far as to say knowing how to yield your ass off until you have a chance to run like hell is the way to go when it comes to surviving violence.
We all know that under stress, humans fall into their training patterns. So the defensive techniques we use are the ones we have recently trained. That is why unaltered Yoshinkan curriculum is taught as tactical training to the Kidotai (those black-clad, Japanese riot police you saw in clips of the Tokyo subway nerve gas attack).
If you have been doing a lot of three-man jiyu waza and tenchi nage is your "go to technique" (which happens), you are in for some big surprises if you come upon a situation you have to intervene in (which happens).
My assertion is that many Aikido dojos do their students a disservice by not preparing them for this eventuality. Many mid and high level practitioners do not have a realistic view of their martial effectiveness. Someone has to tell them, before they get themselves hurt. That
is uke's job, IMO.