That doesn't sound like a real metric to me. The concourse is where people will spend much of their time, it is where the capacity is being adding, and it is new functional space. The new roof is only eye candy only visible for the brief few minutes you are on the platform but do nothing to add function or capacity to the space.
I'm not talking from a technical perspective, I'm talking from the perspective of the average person. Yes, adding capacity is all well and good, but I would think the average person would notice the asthetic changes more than the would the operational changes. They may notice that stuff has changed, but it will be the visual changes that will have the most impact on them.