Because to reverse it you need to have a functionally complete baseline to compare it to. For the Librem that baseline is what it ships with (PureOS). For nearly every other device on the planet, that is Android.
By them focusing on creating fully functional free drivers to swap out with the non-free driver blobs on Android, they will have created a reference source that can be adapted for any other OS.
You're right about the drivers, but you don't need to reverse engineer them for Librem 5: They are already free. You only need to do it for the firmware, which AFAIK doesn't depend on the OS.
"Non-free driver blobs" in the librephone context means anything needed to drive the hardware. i.e. kernel drivers, HAL modules, firmware images, user-space vendor libs, etc.
But sure, librem5 probably has most of that already.
Because they aren’t focusing on a specific piece of hardware… I’m really not sure what you are expecting? The librephone project to be focused on librem5 instead of the hardware used in thousands of other devices?
Because to reverse it you need to have a functionally complete baseline to compare it to. For the Librem that baseline is what it ships with (PureOS). For nearly every other device on the planet, that is Android.
By them focusing on creating fully functional free drivers to swap out with the non-free driver blobs on Android, they will have created a reference source that can be adapted for any other OS.