I think the PP still makes for a great educational device. I was following the Lupyuen tutorials for PinePhone nuttx for a while, and then got inspired to have a go at following his revese engineering journey using Zig. It has been slow going but great fun! Just started on volume keys.
They say they continue production on the PP for 2 more years, so hopefully I'll have a bit more than 'Hello, world' by then.
But buy a serial debug cable and SD card extension if you decide to have a play with one, huge time savers! I only just got mine and it has speeded up things no end.