Hmmm,
First the purpose of karate was not to fight, in the sense it is to end the attacker's ablity to attack, which could ramp up to destroy, but only in very specific circumstances.
The toolbox of karate, the kata contain many techniques which cannot safely be applied to an attacker without damaging them. They're not for fighting but for concluding.
Now if you're not prepared, surprised, it might end up a fight but that's hardly what karate was geared for with it's force multipliers, tactical studies on movement and strategic placement.
The problem with fighting is there are ony three main objectives.
1. You break them
2. They break you
3. You each break each other
and various sub categories of degree, none of which a rational person wants to be engaged in. The first option "you break them" makes more sense in a non-fighting atmosphere where you end them under their event horizon.
Second Okinawa is not Japan. Whatever happed in Japan isn't necessarily reresentative of Okinawa. The Okinawan's never really banned weapons, most of their weapon systems (which developed separately from karate) were more focused on just kata practice, as they didnt' have people with weapons really attacking them.
Karate came from private practice, whatever the people felt was appropriate did not enter into karate's developmen, for karate was not for the people.
If we were Okinawans, say 150 years ago, we would likely not have any opportunity to study karate as it was the preserve of the very few, most frequently from elite families and those with connections.
In any case use of the chamber can be a powerful tool if one wishes.