Distinguishing the Messenger's call from Allah's effective enabling does not negate human responsibility. The servant hears commands, can engage with reasons, and responds within the sphere of voluntary action. Acquisition and choice remain relevant.
It would also be mistaken to infer that, because Allah creates actual guidance, teaching and invitation are useless. Religious means are still prescribed; conflating a means with independent creation of its outcome is a separate fallacy.
The distinction preserves both relations: creation belongs to Allah, while choice, effort, and accountability belong to the servant in their proper sense.