Desktop environments are not equal form the security perspective, but they all are rather insecure, because security is hard and harms UX, and the GNU/Linux desktop is traditionally focused on UX and the user freedom by sacrificing security. However it is possible to build a secure environment based on an insecure DE, what Qubes OS does with XFCE, for example.
I’m happy to see a niche decentralized thing from Jack more than if it was another commercial start-up. And I have nothing against yet another bluetooth chat. But I’m not impressed. In the whitepaper nothing is written about spam protection, so it wouldn’t work as a reliable P2P app at scale. And the UI… It’s mere a toy for Jack’s personal nostalgia about “the good old times”. And nostalgia driven development doesn’t work in general, I would say.
I’m a big fan of the idea of sandboxed apps. Flatpak is not great as it compromises sandboxing for compatibility (both with distros and apps) and also it’s quite stagnant now. But there are no other options anyway, so I use it.
My distro is not the best, I would rather say it is the least bad for me, because I don’t like any.