The Light Phone looks pretty neat and I like the idea of a more minimalistic device (especially with e-paper), but it's pretty unique hardware and a custom Android that needs jailbreaking to update if the company stops supporting it.
It also looks like the third iteration won't have an e-paper display, so I'm not sure the beneft of that version will be against a ultra power-saving mode / locked down Android or a mobile Linux on much cheaper hardware.
And have presidential immunity.