I can answer to this, having worked on an assistant that is always on, from your phone.
The platforms (ios, Android, etc.) are very limiting. It is hard to have something always on and listening. Especially apple is aggressive with apps running in the background.
You need constant permissioning and special privileges. The exposed APIs themselves are not enough to build deep and stable integrations to the level of Siri/Google Assistant.
The platforms (ios, Android, etc.) are very limiting. It is hard to have something always on and listening. Especially apple is aggressive with apps running in the background.
You need constant permissioning and special privileges. The exposed APIs themselves are not enough to build deep and stable integrations to the level of Siri/Google Assistant.