Very true, that's why they can't be a single solution to transit problems. They are good for serving some areas, and work well when mixed with urban rail, subur

Very true, that's why they can't be a single solution to transit problems. They are good for serving some areas, and work well when mixed with urban rail, suburban rail and buses. Use rail for high-density areas that change only over multiple decades, and buses for low density, mutable areas.