Signal feels the closest, it’s basically equivalent to other messaging apps. Somewhat cleaner and easier to use IMO

The only downside is chat backups for people coming from Messenger, in particular those on iOS devices. Streamlining that process might get me to go “contact me on signal, I don’t check messenger often”, but right now I get why there’s a last bit of friction with my friends

WhatsApp has a similar limitation but they walk you through the backups process. Even then, they limit backups to google drive iirc. Signal could do something similar, but much better by explaining the process and opening up backup locations