Since you mentioned 100% remote, don't you think Zulip has advantage over other chat apps because of the asynchronous nature of conversations? Zulip team is also fully remote. We have core team members in North America, Europe and Asia all using solely Zulip for communicating. We don't do video/audio conferencing. All most all the decisions are made via text chat thanks to the wonderful asynchronous nature of Zulip threads :)