Victor posted the announcement as a Google docs link in the app’s discord this morning.
Basically they said that developing two apps was slowing down development.
Specifically on Linux support they said this:
We’re also exploring what Linux support might look like for Vortex in the future. While getting every game and mod working on Linux might not be possible, it’s an area we want to keep evaluating where it makes sense.
It’s too bad, every option for modding items running through proton honestly sucks.
Yes, it’s 100% doable, but Vortex was our only shot right now at getting it to the level where an average non-technical user could feel comfortable with it.