A toast provides simple feedback about an operation in a small popup. It only fills the amount of space required for the message and the current activity remains visible and interactive. Toasts automatically disappear after a timeout.
Makes sense. If a application work like it should without the extra permissions (i guess record audio is needed to control the app via voice, but i have no clue for what the external devices permission is needed), it is totally fine to disable them. You could also check Tracker Control, if you are concerned about apps and there communication.
Maybe the /e/OS version for your phone (i use a Gigaset GS290) is based on another Android version (mine is based on Android 10) and this is the reason why i can’t find the PrivacyGuard on my phone. I have a Dashboard in the Privacy settings.