If any of the people you introduce to linux would care about systemd

Works really great. I use it a lot and the interface is easy to navigate.

https://getaegis.app/

It is foss software with a big community. Not getting any safer

Update your channel & rebuild

Why not. Peer to peer sounds like a good idea: https://radicle.xyz/

You know what? I will buy it again for you right now!

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Try setup arch or even gentoo with the help of the arch wiki or gentoo wiki

Anything that is flashed with tasmota is fine. You can also buy them preflashed. https://tasmota.github.io/docs/

Emacs!

Not so high because of frequent updates and reboots for security