trying to scale up single servers has a limit and runs into complexities and diminishing returns. everyone scales services by sharing the workload among multiple servers, even when they present themselves in a way that gives the illusion of a single server. we don't have any pressing need to give the illusion of a single server, we can scale our federated network by adding more independent servers, which is both cheaper and lighter. (maintaining the illusion of unity has a significant cost). multiple separate servers also make for a healthier decentralized network, at least when they aren't under control of the same entity.