This post is from the WWDC26 App Intents & Siri Q&A.
Currently, I have a mix of SiriKit (Car Commands) and App Intents. Should I migrate everything to App Intents and discontinue SiriKit? Is there a compatible/similar AppSchema to Car Commands?
For Car Commands specifically, you should stay on SiriKit since there isn't an equivalent that is offered in App Intents. For use cases that are covered by AppSchema, I'd recommend adding support since that will offer more touch points for customizing any visuals that the user will see. As to removing SiriKit all together, you should keep them around if you want to support any device that does not support Siri AI