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The RunLoop scheduler is busy when there is active user interaction(like table view scrolling). All the downstream data updates will be delayed due to this. Using RunLoop works but it would delay network responses, until RunLoop.main is free to process. DispatchQueue scheduler will work just like any other DispatchQueue.main.async blocks.
I haven't simulated this scenario, but it is elaborately discusses in Swift forums. In most cases difference might not be visible. Although, in this framework's context it might be more sensible to use DispatchQueue scheduler.
References: