There are also other basic issues with Signal (message deliverability, buggy and spurious “device number changed” notifications, etc.).
Note that I do use Signal and advocate it, but I do that with only certain people so that I don’t burn my personal “relationship capital” unnecessarily with a poor solution.
He's had to adopt a local SIM card over there for security purposes (Russia's listening) and uses WhatsApp regularly. He asked me to pick it up, and instead I referred him to Signal.
This was [part of] his recent response:
I downloaded signal but they want to confirm my number but my sim card doesnt work over here and my european card is data only.
So that is one blocker for sure but otherwise I always push people to Signal as a reasonable alternative.
https://theintercept.com/2017/09/28/signal-tutorial-second-p...
[edit] The native desktop app is even better than WhatsApp's (doesn't stream data from your phone).
Group chats are also fairly decent on Signal, I just wish there was a way for an "admin" to exist to moderate users in the group.
Except my friend's gf could never really see when messages were using data or SMS. And my friend put a stop to the experiment because the linux client was leaking RAM like a dam and we both had sync problems between the phone and the desktop client (we are both huge telegram users for the smooth experience when connecting to your account and for syncing. We both despise the privacy risks though).
It is private. Create a channel and invite your friends. Thats it.
Disclaimer: I work for them.
With respect to interruptions/noise it doesn’t have any advantages over Slack.