The Javascript callback events (https://www.typeform.com/developers/embed/callbacks/) should contain more information about the step/form.
For example, onQuestionChanged should contain the values of the step that was just submitted. onSubmit should contain all input values from the form.
This is important for tracking we want to do. Tracking values via JS is very easy but the current workaround via webhooks/integrations (e.g. Zapier) is more time consuming and expensive.