>>no practical sparring to get rid of the worthless techniques>>
Perhaps there are no worthless techniques...
Aikido takes a long time to become second nature - much longer than most other martial arts I have seen.
The ideal is be be at the point where there is no 'technique' merely (re)action. These Kokyu can be devastating even when you are expecting them - I have flown over 20 feet into a wall<g>.