I’m trying to transition my friends over to simplex but they’re hesitating for some reason.
We need to start transitioning from signal, telegram to nostr:npub1exv22uulqnmlluszc4yk92jhs2e5ajcs6mu3t00a6avzjcalj9csm7d828 
Discussion
I did the same...and with time they forced me to go back to Session.
Notifications don't work (good luck with the "Always On" setting and your battery life), making/receiving calls is still useless on slow connections. I've also received so many complains about the granularity of the settings (which is generally OK for control, but the normal user want simplicity).
My only grudge is on the decentralization part. I think Session is way superior in that sense because you don't need to specify the servers, so it's all automatic. As a matter of fact, SimpleX is currently blocked in Cuba because of that — and the build your own sever path is really not an option for mainstream adoption.
For me notification works and I am not on "Always On" however I got your point for that and for the granularity. People coming from Whatsapp are a bit overwhelmed. The servers are nor really stable and from time to time they have maintenance stop in which case sometimes an automatic server change is done but its not instantaneous and can leave you uncommunicated. Groups are really bad at this point but let be fair, the app is only about one and a half years old. Lets give it some time to mature!
This group values privacy a little more than the average person so I think maybe they’ll try
Keep being persistent and constant, they will come, trust me. Got 11 private contacts now. Took me months of Proof Of Work. 💯👑