Firmware isn't necessarily more difficult than other areas, every domain has serious challenges. But firmware programming has the kind of challenges that require a very deep technical background, something almost impossible to build in an X-week boot camp:

- Insane debugging: you have to debug extremely low-level failures with very limited visibility (e.g. no operating system to catch your segfaults) and proprietary or complex tools.

- A hard language made harder: C is difficult to get right, but embedded C (no dynamic memory, lots of bitwise operations for MMIO register writes, targeting exotic architectures, etc) is even more difficult.

- Extreme constraints: The products you work can have constraints like safety certification, minimal power utilization, or ultra low latency response. Meeting those constrains often means having to deeply understand hardware.