Neither expresses an opinion. Lutsina only speaks about potential effectiveness, not about actual successes in writing social criticism. Priscilla doesn’t say anything about successful sci-fi writers.

Neither expresses an opinion. Lutsina doesn’t discuss skill. Priscilla refers to skill at imagining technology and social arrangements, but doesn’t refer to writing skill. Neither compares writing skill among sci-fi and conventional writers.

This is a point of disagreement. Lutsina thinks sci-fi does hold more promise. Priscilla thinks the most effective social criticism happens in conventional fiction (and therefore not in sci-fi).

Lutsina doesn’t express an opinion about this. She refers only to envisaging new social arrangements, but says nothing about new technologies.

Neither has an opinion. To Lutsina, imagining new arrangements can lead to better criticism, but that doesn’t mean anything is required to be effective. To Priscilla, current arrangements are important, but that doesn’t mean comparisons to other arrangements are required.