Not as easy as the ARM, but fewer parts, cheaper, & more common parts.
The pi has a dearth of IO capabilities. It only has 1 UART, 1 SPI, 1 I2C, & 4 PWM's available at a time. Someone really focused could probably get the single UART to switch from the console to driving the radio & get the PWM to drive servos.
It's such a specific platform & the autopilot still needs to be compatible with a laptop to throw more clockcycles at machine vision, a USB microcontroller is the only useful option. If a microcontroller doesn't have enough pins, the same code can be moved to a better one.
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