Absolutely agreed.
I run three Discord servers:
- A tiny one for my company, which we use much like one would use Slack within a company, including voice and video chats.
- A medium-size one for the open source community around the company. It includes project-specific channels (three-way mirrored between Gitter and IRC thanks to the wonderful Matterbridge: https://github.com/42wim/matterbridge/), general channels, voice channels etc.
- A large (20k users) one for our company's (gaming-centric) userbase.
Discord is a fantastic tool that adapts to all three situations very well, scales really well from 4 people to 100k people. Its DM/friendslist system scales a lot less well, but is still very usable with 100+ DM channels. I have even created a personal (private) Discord server where I'm keeping a journal of what I work on, inspired by a HN post the other day (https://news.ycombinator.com/item?id=15823599).
Discord is scalable messaging UX done right. I'm a huge believer in what they do. (Yeah, if only it were open source etc, I get it; different problem, different story)
I much prefer it over Gitter for open source chat (Gitter's only real advantage is how well it integrates with Github). And IRC is... well, not in a good state today. IRCCloud.com does wondeful work but they're small and it's just not enough.
I just wish Discord would get phonecall support, but that part is probably not going to happen. It's doable with a bot though. PhoneCord (https://www.reddit.com/r/discordapp/comments/6hlesz/anyone_e...) used to do it, they were shut down because of the obvious abuse implications but I'd really like to hook up Twilio with Discord in a bot for my company, internally, so we can do phone conferencing from it.