This just made me realize, if cars are to satellites, we don't really have a bus to xyz equivalent. Cars are great and all, it gave a generation flexibility to go where they like but they don't scale. There are denser forms of transport for urban areas like rail or bus. And as the sky gets more debris filled it's going to be like the urban area analogy where we need a public transport for space where we co-locate payloads on one object at scale. Some places host a 3rd party payload on one satellite, but nobody hosts 50 on one structure.
One of the harder parts about that is setting up the attitude of the SV so that each payload gets time pointed at the earth (if that's what it cares about). A while back I worked on https://en.wikipedia.org/wiki/CASSIOPE, which had multiple payloads, and giving each of them appropriate earth-facing time at specific parts of the orbit was... a delicate scheduling problem.
