Meanwhile in the "repurpose existing phones" camp: https://wiki.postmarketos.org/wiki/SDM845_Mainlining
Yeah, sure, the Librem5/Pinephone boot directly into open source firmware instead of some Qualcomm monstrosity that even acts as a hypervisor, but. Near-mainline Linux with GPU support on actually powerful devices with 3-ish-GHz fast cores, 8GiB RAM, and so on. And you can buy these on the used market rather than investing in more new e-waste.