I am positing a moderate training path in which uke stays attached and gives feedback, body to body, appropriate to the level of the partner. Incrementally correct movement by nage shows as a reaction in uke. Uke doesn't try to make nage fail - uke's body guides nage to correct movement.

Note the OP is talking about folks who are still working on basic kihon waza. An attack that is always faster and harder than can be handled is not a learning experience.