xahl
51cc7bd1e2cbffe6daafeab251627e0c1219c35fb6df2dbc262e641dca3e267c
we are already there － we always have been
OpenPGP － AEFC 5DAC 0DF0 6CD5 F39F 460E 341A B046 14ED 0E1D
If you're using GrapheneOS then the Signal fork that is Molly-FOSS from the new Accrescent app store is also very good.
No proprietary Google code + some of the functions that were going to be included in Signal but were never implemented.
SimpleX is certainly smooth for sure.