In addition, during the beta, there are only so many satellites (see https://satellitemap.space https://satellitemap.space), and because of that, I don't think

In addition, during the beta, there are only so many satellites (see https://satellitemap.space https://satellitemap.space), and because of that, I don't think they have the bandwidth to cover every 'cell' of coverage, so they target certain areas to make sure those areas have a satellite for the majority of a day. The further south you go, the less coverage there is at any given moment (due to the rotation of earth and the orbits of the current fleet of satellites), so they can't just let dishes be assigned anywhere, they have to pick areas.