> For the step update, you can use Out Of Band update

I did mention using OOB, but I preferred swapping the entire Stepper because the logic on the backend was just a little bit cleaner, and the Stepper didn't include anything else anyways.

> I usually solve the second problem by simply saving the state of the individual input fields, you only need a user session.

I believe this is exactly what I did in the article, no?