When you use the Discord app, you use a browser - Chromium specifically: Discord is an electro app.
In other word, if you already run a browser that burns hundreds of megabytes of RAM, disk, and requires tons of CPU do display simplistic things, as browsers do, you might as well use it to access Discord instead of running a second insanely wasteful browser disguised as a native app.
When you use the Discord app, you use a browser - Chromium specifically: Discord is an electro app.
In other word, if you already run a browser that burns hundreds of megabytes of RAM, disk, and requires tons of CPU do display simplistic things, as browsers do, you might as well use it to access Discord instead of running a second insanely wasteful browser disguised as a native app.