Re: Aikido does not work at all in a fight.
for reality...Aiki matters.
It matters when it matters.
When you start talking reality, OODA, IMO, matters first and for most. If you are ahead and beating your opponent and can continue to stay ahead, it really doesn't matter how you do it, be it fist, baseball bat, or what not.
However, if you are behind, or trying to stay ahead, Aiki can matter greatly and change the situation greatly.
Aiki, simply put can keep your opponent disorient, prevent them from indexing or orienting. It can also provide you strength in an area or position in which can normally be considered a disadvantage.
For me, it is all realitive in the overall picture...how much it matters.