As much as GOG/CD Projekt have more than their fair share of problems, usually their versions of games work, can be preserved, don’t require as much bloat, launchers included, and usually don’t require 3rd party validation. And like others said, besides Wine and related, and installing through Steam as external games, you can also install stuff very easily through Heroic and the sort. So I’d say it’s the better option indeed.

Besides Flatpak, Heroic also has an official AppImage version, if the OP wants to have an even more portable program.