A system I’ve been using for a while now keeps in mind that inits are functions.

Rather than having massive tuples for the inputs and outputs. I have a struct for each (without the ViewModel boilerplate) and an init on the output that takes the input as an argument. QED. I grant though that this system doesn’t produce the handy warning if you forget to bind to an output.

See more of this idea at: https://github.com/danielt1263/RxEarthquake