I think looking at how Gravity Forms (and similar) handles this within the WP ecosystem is a helpful starting point. A lot of expectations around what a form service does and doesn't do are set by those plugins – for better or worse.
I personally believe that sending a confirmation to the person filling out the form is a requirement, in some cases, and not having it would be a mistake.
I personally believe that sending a confirmation to the person filling out the form is a requirement, in some cases, and not having it would be a mistake.
Forms are tough! Glad ya'll are working on it.