Make trello card ID available in the variables
The "Add Trello Card" action should make card Id of the created card available as a variable to be used in subsequent steps of the journey. This will open up possibility for people to write custom logic as part of their webhooks to update those trello cards as per their own business logic. (eg. move cards, tag people, update custom fields etc).
This idea can be applied in larger context too. Having any action that calls well-known third party apps, the unique id returned by that thirdy party app should be made available as a variable in the scope so that it can be used as --third-party-id-- in subsequent steps.
This will openup a infinite possibilities in terms of automation.
Users can create their webhooks for anything that is not available in autopilot at the moment. Those webhooks can receive these --third-party-id-- and do whatever they want with them.