This is horrible logic and ignores important opt-in/opt-out dynamics which are critical to our conception of privacy. By enabling "self-destruct," (or "disappear") the sender merely forces the recipient to "opt-in" and take affirmative action in order to archive the message (i.e. Screenshot). This is how telephone conversations generally work -- no recording unless one party takes action to tape it. Despite this ability to tape, we certainly still consider telephone to be more "secure" due to this archival distinction. Very often it is the advice of lawyers to avoid putting something in writing, and communicate it in person or over the phone instead. Disappearing messages brings us closer to this desirable ephermerality.
Because it makes me look like a drug dealer. Which is to say it is easy for me to guess why most the people in my contacts who use Signal, use Signal. Some are journalists. Some are tech researchers. The guys with bad jobs who aren't good at computers make me wonder...
Is there a way from preventing certain contacts from knowing I'm on Signal? Like, it is embarrassing that Jason from college knows I'm on Signal. I know you guys will disagree and say it is not embarrassing, but it seems that a privacy-focused app would respect this notion. Obviously being a member of certain apps (grindr) can be seen as negative. I think I should be able to Whitelist my contacts.