Would you explain better you set-up? At least a reference to the underlaying system. Is it kubernetes?

What is your “legacy phone”?

This is perfect

Sorry, I thought I saw onlyoffice mentioned but I am wrong

Why not? In my experience it is the most compatible with MS office

Just wiped my HP Stream and installed Fedora. Much faster then Windows

I would add file managers like midnight commander, ranger, and so on

Is it based on debian unstable or testing?

What are the advantages in your opinion?

What do you mean Delta chat is on the fediverse?