Jonathan Punt wrote:
Should you allow tori to practice their Aikido or should we make it as difficult as possible for them to train?
You should never make it difficult for them to train. Throwing yourself even when their technique is ineffective, for example, makes it extremely difficult for someone to train.
One should pitch the level of 'resistance' according to a person's ablity, and also vary it according to what you're trying to achieve.
There's no point in frustrating all tori's attempts at a waza, but similarly if you never offer any resistance at all you deny them any opportunity at real practice.