Comment by MrDrMcCoy

Vortex at one time did have a native Linux version. IIRC, it had very minimal game support, lagged behind the main branch, and was eventually canceled. I don't think they're interested in contributions for native Linux. A separate app seeking to implement Vortex API and package support would potentially be more free to improve the UX, do Flatpak/Appimage, or use more interesting Linux features like overlayfs and FUSE archive mounting. I have a mind to try my hand at it, would be a good starter project for a new language.