Earlier quoted context omitted.
Because Slack killed their XMPP and IRC bridges, so the only way to connect to is via the official interface.
> so the only way to connect to is via the official interface. Not true. There’s several alternative clients.
I don't need ANY changes in my XMPP/IRC client to connect to a server.
But the reason why Slack discontinued XMPP/IRC is clear. They want people to use their shitty app/website.