> The reason you don't see them all that often is that none of them have close to the usability of the Pi
I think what OP wanted is usable NUC alternative on ARM (popularity is the result of that and is really proportional), so little ARM hardware is tolerably compatible with Linux (be it GPU driver, network driver, bootloader or whatever else cr*p ARM hardware makers keep to themselves), unlike NUCs which is actually really nicely compatible with Linux.
I think what OP wanted is usable NUC alternative on ARM (popularity is the result of that and is really proportional), so little ARM hardware is tolerably compatible with Linux (be it GPU driver, network driver, bootloader or whatever else cr*p ARM hardware makers keep to themselves), unlike NUCs which is actually really nicely compatible with Linux.