People suggesting that Orion provide distro packages for their preferred distro may not understand how packaging and maintainers for Linux distros work. You make software people want to see in their distro repos enough, and someone from the community steps up to make it happen. Doesn't require any real resources on the Orion team's part beyond hosting binaries somewhere with release notes (and having some point of contect for the maintainers). While many newer/casual Linux end users see flathub/flatpak as "the app store", plenty of experienced users who understand the benefits and drawbacks of getting software directly from the independent software vendor would prefer to trust the maintainers and install via their chosen distro's package management system.
Obviously during the alpha/beta most of us are understanding of resource priorities, and will gladly accept a flatpak / appimage or what have you. Given that Orion already seems to be going beyond the existing major webkit browser on Linux (epiphany aka GNOME Web), and given Firefox continuously footgunning themselves, I happen to think this will be a popular one. Finding maintainers to package it for major distros shouldn't be a problem.