Can non expert users actually build distributed systems? I mean they can start it, but will it actually give correct results and scale and handle concurrency concerns?
I can't speak to it at Very Large Scales, but I've seen non-experts do pretty well with Akka when strong guardrails are put in place by seasoned developers. No reason to think that Orleans (which I've studied but not used heavily, though that might change with CoreCLR) couldn't pre-bake that a bit. I mean, eventually that sort of thing will fall down, but almost anything will.