The (linux) desktop app isn't as tweakable as telegram. Telegram lets me turn off every little animation. Also there's no taskbar icon.
I was worried that the message about it not syncing message history to new devices meant that it wouldn't sync between devices, ala f-chat. That is not the case, it does sync.
It does chat. Seems to do it well. Is actually pretty customizable. Seems nice. Usernames behave as expected, mine is plumpan.76 . Does feel a little weird using "WOW SUPER PRIVACY" app as "yeah just chat to me here" but... that should be normal! Top level security for sending cat pics and fresh furry art you've commed.