Hmmm, I have not experienced these disappearing messages, although, maybe I have and I don't know it. I wouldn't know if one of my messages didn't go through to the other party would I? I will have to check with my friends and compare their message history to mine next time I see one of them.

Also, yeah I am desperately waiting on a secure messaging app that is has good crypto, ios/android, AND desktop support. So far there isn't one that fills all those, so for now I'll settle for good crypto rather than platform support. From what I understand, multiple logins from devices using the same identity is really hard for good crypto? I'm not sure but that'd explain why all the top secure messaging apps don't do it. yet.

Being open source and audited also matters a lot to me.