I do think a modern chat app is a value-add for fast moving (tech) companies. It is a nice hybrid between sending an email or knocking on someones door for a chat.

And as for the 'chat commands', they're usually just thin wrappers around the UNIX style tool. It's maybe not the most reliable way, but it does have a low barrier and there's not much lock-in. I used to have my server email myself whenever something needed my attention, but now it'd probably use a Discord bot for that.

However, I still wouldn't use it professionaly. the lack of self-hosting (privacy) and archival(bots can solve this pretty easilly) and restricting DMs (see slacks previous issues) makes Discord unsuitable.