Alright, I finally got a round tuit…
A couple links for future audiences, since none were provided:
Yeah… Ain’t nobody got time for that. And even if Bubblejail is technically superior to Flatpak, the latter should be readily available on any major distro out there. Moreover…
Using distro packages generally means having to trust additional people (maintainers), whereas Flatpak apps are much more likely to be provided by developers themselves.
That said, I do not mean to dismiss Bubblejail outright, and may take a closer look at it eventually – if it ever lands in Fedora repositories.