Integrations that need to use a Bluetooth adapter should add bluetooth_adapters in dependencies in their manifest.json. The manifest.json entry ensures that all supported remote adapters are connected before the integration tries to use them. This replaces the need to add bluetooth in dependencies.
Integrations that provide a Bluetooth adapter should add bluetooth in dependencies in their manifest.json and be added to after_dependencies to the bluetooth_adapters integration.
Be sure to check out Best practices for integration authors when building new Bluetooth integrations.