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

Update your channel & rebuild

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

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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!

Read again

There only is the website. Even the app is a website

Not so high because of frequent updates and reboots for security