For me, Midjourney was the killer app which showed that chat apps can be good interfaces for products. It takes away many UI development costs and problems and allows you to focus on the product/backend.
On the contrary, personally I'd be on any competing platform were it as-good-as just to escape the Discord integration. Maybe if they didn't spend so long on that absurd homepage they could have built an API or something.
Clearly no as Midjourney is working on a web UI that'll be out this year. Personally, I'm turned off by Discord's UX and one of the main reasons I don't use midjourney.