When comparing against something like a Pixel running GrapheneOS, it's honestly a bit more puzzling to me. Granted, I'm definitely not the audience for this, but with G_OS you can do most things that a regular phone can do, without taking several minutes to install Firefox.
As much as I love privacy (going as far as having a semi-random username), this phone is a bit puzzling. I hope someone can throw more light on this.
I run Arch Linux on all my devices with no Desktop Environment. The simpler the system the better. Running Android Framework along with a runtime, even though it's all open source, I'd rather as much of it be free software as possible. If I could run my phone like this I absolutely would but the Librem 5 is as good as it gets while still having a device that fits in my pocket that can make calls and text.