Exactly. If you increase the capacity of a bus in a highly crowded area, the bus will still have 100% occupancy, but that doesn't mean it didn't help. The throughput increased.
Much like adding an extra lane to a highway, more people will use the highway and you'll be back to the same crawl. But technically there's more flow/capacity.
Much like adding an extra lane to a highway, more people will use the highway and you'll be back to the same crawl. But technically there's more flow/capacity.