Hmm how do we make our voice heard?
There is a t-mobile community with a topic about this. Im going to sign up and comment and write t-mobile with links to both these forum's letting them know we dont like this feature.
Sure, but sometimes you forget to mute the device and you, for instance, wake up your partner who has work in the morning. There is no reason a setting cannot exist that automatically silences this boot sound regardless of the phone volume.
The app Silent Boot was once a workaround to accomplish this, but it no longer works in the latest Android versions.