Last time I looked it had way less features then yunohost and its closed source.

Des, it has, what most others lack: Single Sign In and many Apps.

So it cant recieve messages if your chat partner went offline after sending it while you were offline?

Use https://lemmy.ml/c/simplex https://simplex.chat/ European (minority US VC), OpenSource, most secure and not centralized and multiple Profiles, routing over multiple servers Its what skred aims to be: “you don’t need any email address or phone number to use it. Skred is open. No subscription is necessary, there’s no operator, no SIM card and no tracking.” https://simplex.chat/