Well today I learned.
I didn’t think “third party” like homebrew would be preferred over ostree-rpm, but makes sense that you shouldn’t change too much from the tested main image.
For anybody else, here’s the exact caveats with rpm-ostree: https://docs.bazzite.gg/Installing_and_Managing_Software/rpm-ostree/#major-caveats-using-rpm-ostree
Personally I mainly used it for fcitx5 language input method some years ago, but I see now that fcitx5 is included in Bazzite, and also that it should work as a flatpak or in distrobox, https://github.com/ublue-os/bazzite/issues/2996


LTS gang rise up ^^