Yes limiting the PG to downtown only is quite an immersion killer once you get to the edge of it. I cannot understand why they are not just doing the whole city, when there is obviously PG data available for it.
Do they have to do the PG cities by hand?That would explain the slow progress. But it would still be better to do a whole city + suburban area then only downtown areas of multiple cities. And then maybe hire more people to speed up that process.