Im not super versed in hardware, but whats the reason you can't adapt this to run on an ARM microprocessor chip? Why go with FPGA? Like if I could buy a Cortex

Im not super versed in hardware, but whats the reason you can't adapt this to run on an ARM microprocessor chip? Why go with FPGA? Like if I could buy a Cortex board and write Python, hit compile, and have the thing run, this would be INSANELY useful to me, cause cortex chips have pretty great A/D converters for sensing.