I think that there's a real question as to whether or not that technical ability ever comes to pass (at least in the context of the big throws that are a staple of almost every Aikido dojo) - even the direct students of Ueshiba often mentioned how scary it was to take ukemi for him, and that was in a controlled situation with people who knew how to protect themselves.
OTOH, if people take ukemi instead of being injured - doesn't that condition your body (the thrower) in the wrong way?
I didn't understand your first point could you elaborate?
As to the second, if one takes
ukemi, then it was given as an option ( perhaps unintentionally :-) ) by the thrower. Allowing ukemi is the kind of choice I had in mind.