If this is your reason then I would say you are trying to hide.
>Is it "hiding" to seal the envelope of the card you're sending your Valentine?
Yes, the point is to keep it a surprise.
>helps protect queer youth from intolerant violence (at home and abroad, as in Ghana).
E2EE doesn't prevent a parent from taking their phone and seeing their messages. These kids aren't communicating to their friends over their parent's IRC server. Most parents aren't technical and wouldn't even know how to MITM even an unencrypted messaging app.
>helping victims out of these relationships by enabling them to contact friends for help
Again most people don't know how to MITM this traffic. Especially if you are using mobile data.
Even in regard to whistleblowers they only need anonymity. They want to do the opposite of hiding their messages. They want the opposite. For as many people as possible to see their messages.