I love this whole cyberdeck thing.
I remember back in the early 2000s, there was a lot more innovation when it came to portable devices. There were gadgets that sort of resemble modern smartphones just clunkier (iPaq), ones with keyboards below the screen (BlackBerry), ones with slide out keyboards (HTC and others), ones that flipped open like laptops but could fit in your pocket (HP Jornada), etc.
Somewhere along the line all that innovation went out the window and now every single phone or gadget looks more or less exactly the same. Like take the top 10 or 15 smartphones, debrand them, and put them in a box, and 99% of people couldn’t tell the hardware apart.
You would think there would be a market for some level of variation, or just have one company that makes the phone 5 mm thicker but the battery lasts for 3 days. But we don’t even see that.
Foldable screens seem to be spurring a little bit of innovation so I have hopes. But until then, I would love to see some of these cyberdeck designs put into production. I would happily pay a couple hundred bucks for a raspberry pi equivalent of a Jornada 720 (as long as the keyboard is touch typeable like the old one).
The problem with this question is your friends, if whatever you decide on isn’t something your friends have or are willing to get, then it’s not useful for you. Signal offers probably the best mix of adoption and security. It however misses a few notable features, for example the iOS client has no way to back up or restore your messages. I’m a big fan of matrix, which seems very extensible and has good security, but if you are in a sensitive application like an authoritarian country, it wouldn’t be my choice. All the messages are stored on the server and while they are encrypted it’s still not what I would use for a chat I never want to see in court.