A small sidenote: chats
are shitty concept in general. They have had a reason in a past era when voice coms are expensive and limited, they have a reason in terminals to broadcast few messages, no more.
For real communication we have letter so in digital world mails or we have phone calls so in digital world VoIP one's extended with eventually video/screen sharing and conferencing capabilities, no more.
Discord, Slack, ... are all only a mean to keep abandonware live for business purpose and, unfortunately, many companies fell in the grave. People who want productivity should rediscover classic software, modernized to actual "graphic style" but nothing more so:
- good desktop MUA (I can, unfortunately, only list notmuch-emacs, mu4e, mutt, pine) instead of limited and limiting webmails. Of course we have to add few things to the mix like having our mails in a local maildir and a good filtering/autorefile/autotagging solution (alot, IMAPFilter);
- good VoIP desk/softphones, something like old sip-communicator (now Jitsy);
- decent software to share screen as needed (actually I know only proprietary one's like bomgar, anydesk or teamviewer, xpra etc are simply too limited);
- local, well integrated, productivity suite. Mine is Emacs, not easy to convince office guys to learn it, but even ancient plain office suite can do the business with a decent DMS that enforce good taxonomy and have decent full-text search (YaCy for search, nothing for DMS in my list... They are all crap)...