How about Delta Chat? At least as secure as Signal, open source, and decentralized.
eodur
I've not used i2p but I've had to mess with a lot of other random weird tools under bazzite. I'd suggest installing it in a distrobox. There is a command for linking programs from your host into the distrobox and then exposing them back to the host. I forget the exact syntax but I used it for vscode and intellij and it was really straight forward and worked well. I don't see why it wouldn't work with i2p and Firefox.
Great points, but I'm on the opposite side while being in a similar user group. I never used Arch, but I used Gentoo for a few years and did LFS a couple times. Now I'm using Aurora/Bazzite on my workstations. I hack around on my machines a lot but sometimes I just like stuff that works too. When I need to get some development done, I don't want to run into the weird bit of configuration left over from some previous project. I like that it pushes users towards encapsulation mechanisms like flatpaks and devcontainers. It keeps the core cleaner and more stable. The tradeoffs of having to bake extra packages into a container somewhere usually aren't too bad.
By what criteria?