Just in case my other email linking to the Etherpad was overlooked by some of you because it was buried too deep in the thread:
Let's make this discussion productive by collecting the requirements KDE has for a chat / IM system to become our standard in this document: https://notes.kde.org/p/KDE_IM_requirements This is supposed to be the basis for our evaluation and ultimately decision, so if you don't contribute, you don't get to complain later ;) Cheers, Thomas