The hardware processes to fabricate a thin phone are complex. Sure, manufacturers do it every day, but if you are a new entrant starting out with a pick and place machine and an OLED screen, you can expect to spend a few years replicating those processes and a couple million bucks on specialized machinery - just for the QA process. So, a big difference to if you just want to do a board. Neo and Librem are both vapor at this point. Neo looks fatter so will be easier, If Librem manages to ship something decent they will have gotten very lucky with their choice of mfg partner. Their budget is very low.