Well the first one was a microcontroller. And this one is an 8-core Arm computer and the project has ambitions of some notoriously difficult things: no binary

Well the first one was a microcontroller. And this one is an 8-core Arm computer and the project has ambitions of some notoriously difficult things: no binary blobs, full mainline support (including a NPU), reinventing small-screen UI for more serious handheld computing, and supporting a ton of high-bandwidth interfaces. This is not a simple step up in difficulty.