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For implementers, backpressure adds complexity without providing guarantees. The machinery to track queue sizes, compute desiredSize, and invoke pull() at the right times must all be implemented correctly. However, since these signals are advisory, all that work doesn't actually prevent the problems backpressure is supposed to solve.
Amy Beson, who was laid off in April as part of wider job cuts at the University of Arizona, said she was not expecting things to improve anytime soon.