It's made by people who care about software freedom. It doesn't use the common ARM-based SoCs which require proprietary drivers and will be unusable with modern software in a few years. Everything except the cell modem (on a replaceable M.2 card connected over USB) runs 100% free software. The device as a whole runs Linux with Gnome, and Plasma Mobile + others also developing for it. The company contributes back to the OSS software they use/improve.
It doesn't have the form factor of the TRS-80 Model 100, but basically the deal you get with it is that you pay the price of a decently high end smartphone in exchange for a midrange smartphone which is completely controllable by you, as much as a normal Linux desktop, but still offers a 'pretty good' UI out of the box for normal phone usage.
How do I know that?
The first I saw about Librem was their original laptop that made clearly overstated claims about its openness. (e.g. claiming a device that used intel CPUs would have completely open firmware). After that I paid no further attention to them.
https://puri.sm/learn/freedom-roadmap/
For instance, all the firmware is completely open. The BIOS can be flashed by the user. What openness do you feel is lacking?
I'm seriously considering my next phone to be one I build.
The hardware is available - cheap 4G LTE modules that plug right into a Raspberry Pi Zero exist; that and a cheap touchscreen will get you around 90% of the functionality most of us need, hardware-wise. You won't have a camera, or motion sensors. You will have GPS, voice, data, a screen, storage...
Basically everything you need for most purposes. And adding a camera and an IMU isn't that difficult, either.
The difficult part is - as always - the software. But people out there are building those pieces. Quite a bit can be done using plain-old Raspbian and Python on top, because the cellular module is essentially a virtual serial port device, and everything else has simple drivers or is otherwise easy to interface to.
Where I'll probably start, though, is with the idea of a custom "cyberdeck"; I already have most if not all of the parts, I just need to find the time to do it. It's form factor will be close to what the TRS-80 Model 100 was, though the screen will be...well, different. I'm considering a few options; probably a standard 800x600 HDMI screen along with a secondary 128x64 monochrome serial GLCD.
The ultimate thing about the whole project is independence (well, as independent as I can get - still have to pay some piper - aka T-Mobile - but maybe voip over wifi could be done in the future?) - and customization.
I may not have everything I want in the beginning, but what I want may only be a bit of extra coding, a tad bit of soldering, or likely a bit (or a bunch!) of both. I'm honestly tired of the games Google and pals are playing; kicking them to the curb may be the best thing to do.