SubscriptionStreamControl is not more or less complex than a tuple. The problem with tuples is that you can not decompose them in a for comprehension like (a, b) <- monadicTuple unless you have the better-monads compiler plugin. Without it you have to do a t <- monadicTuple; (a, b) = t. With better-monads you can still write SubscriptionStreamControl(a, b) <- monadicCaseClass.
So in short: without better-monads a case class gives better DX, with better-monads the options are equivalent.
SubscriptionStreamControlis not more or less complex than a tuple. The problem with tuples is that you can not decompose them in a for comprehension like(a, b) <- monadicTupleunless you have the better-monads compiler plugin. Without it you have to do at <- monadicTuple; (a, b) = t. With better-monads you can still writeSubscriptionStreamControl(a, b) <- monadicCaseClass.So in short: without better-monads a case class gives better DX, with better-monads the options are equivalent.