Exactly!
Discord started as a natural next-generation app for TeamSpeak 3 users, and this is its first core audience. It’s free in a world where TeamSpeak admins had to obtain licenses and pay for servers.
Only after that, as with any platform that offers anything for free, it starts getting abused into other use cases, some who are even adopted officially by Discord. Those include pure text chat, customer support, video conferencing, forums, image generation interface, etc.
Discourse is already better than Discord for some of those use cases, like customer support and forums, and a worse alternative at others, like chat and gaming comms. Also, it simply doesn’t cover some use cases, like video conferencing.
I see Discourse covering more and more of Discord’s use cases over time, be it with voice chat with Resenha - Add Discord-style Voice Rooms to Your Community 
or with live streaming with Discourse Video Stream 
, and simple changes like making a chat room the home page can help many communities’ migration be less traumatic, but I don’t think we plan on being a 1-to-1 replacement any time soon, as there are simply too many use cases that people abuse into any free tool.
Also, I don’t think Discord is able to back down from more and more invasive moderation. We had big customers migrating from it, as having your customer platform where kids are groomed and dogs and cats are tortured every single day is not great for brands.