Firecracker
I suspect that the main reason the Tucano (re-engined of course) was chosen was due to the fact it was to be built by Shorts and it was politically expedient to assist with the employment situation in NI at the time.
I do not recall there were any 'issues' with the FC,and of course the PC9 was already a fine machine.
Although supposedly a 'production' aircraft it appears the Shorts Tucano were anything but 'standard' in panel sizes.