Yeah there are some UX optimizations that could probably be made...

OTOH, I can't think of many big-name mobile apps that don't have some issues with less-than-obvious long-press functionality. (Snapchat seems to literally do this shit on purpose, because it's "fun" apparently.)

IMO that's a general problem with mobile UX... long-press actions have zero affordance. There's no way to tell short of randomly long-pressing on stuff what's going to have an action associated with it.

Tried the iOS app for the first time today and I got a prompt right after login with a small overlay pointing at the profile icon explaining this.