It very much does not. I think it’s designed to make the nominee look like a runaway victor rather than to fairly gauge the opinion of the primary voters. They want the primary to come to a decisive end as soon as possible and the consequence is voters not really understanding whether it’s ok to vote for your favorite or to immediately start voting strategically (the answer depends on how well you think they’ll do). If it was straight proportional we could just vote how we wanted and if they didn’t win their delegates could still influence who did.