What people are finding now when building agenic AI orchestrators is that they are reinventing some of the ideas behind BEAM and OTP. The big one being queues (mailboxes), but also fault isolation.

Async runtimes can’t really do preemptive scheduling so those end up using other methods that, while getting low latency, may not improve reliability or reduce variance in latency.

Orchestrating tasks across a number of different services that are not in your control becomes a distributed system where not everything is reliable.