> I just think that despite all testing and care bugs are still possible, and the ROM bootloader is a backup that's always there.
That's orthogonal to mass storage mode. ROM bootloaders were standard in this class of microcontrollers for years, but they usually don't use UMS. One could argue that UMS is perhaps better than some custom incompatible solutions, but then that's what DFU is there for - a standard way to flash things over USB.
That's orthogonal to mass storage mode. ROM bootloaders were standard in this class of microcontrollers for years, but they usually don't use UMS. One could argue that UMS is perhaps better than some custom incompatible solutions, but then that's what DFU is there for - a standard way to flash things over USB.