Beeper sets a good premise. Talk to your friends without ever bugging them about hopping over to a completely new app. You might convert some, but not most.
There's a downside to E2EE on bridged chats but if that's not acceptable within your threat model then you wouldn't be using it in the first place.
there are exactly three messaging apps: Signal, Matrix/Element/SMS or RCS. anyone that wants to reach out has those options. I've had a lot of Signal converts.
Replace RCS with XMPP, one is in practice only available through Google's approval while XMPP is a standard created by the same organization that create IP (Internet) and SMTP (Email).
Appreciate the comment. I would like to do that but RCS is basically the default "SMS" option on Android making it broadly available to nearly half my contacts, the onboarding is basically "text me", whereas I'd have to provide some sort of instruction if I wanted to onboard anyone onto XMPP, in addition to recommending a good client depending on what OS they're running.