A bit late, but with regard to the FA-50 crash, my belief is that PAF was forced to use the FA-50 at that time because they don't have enough Super Tucano.
The FA-50 was dispatched from an airbase near Cebu, about 420 km northward from the army unit requesting air support. We don't know this unit's exact location, so I'm giving it a bit of a fudge factor. While I don't know the exact disposition of PAF's Super Tucanos, there are usually a few stationed in Zamboanga. But that's about 550 km away to the west. It will be faster to dispatch the FA-50 with their higher speed from Cebu than to dispatch the Super Tucano from Zamboanga.
Ideally the air support should have been dispatched from Lumbia Airfield near Cagayan del Oro that's only about 100 km northwest from the conflict area, but as far as I can tell, on that day there was no Super Tucano there. This puzzled me a bit, as the PAF undoubtedly knew that some sort of army operation was happening, since normally the FA-50s are based near Manila, so their presence in Cebu near midnight suggested a forward deployment, but in that case, why not pre-position some of the Super Tucanos in Lumbia? I can only conclude that the Super Tucanos at Zamboanga were not ready for combat ops that night.
I also figured that there was nothing wrong with the FA-50 that crashed. Again, this is inference, but the 5th Fighter Wing announced night flight training a few days before PAF officially ungrounded the FA-50. The training notice was on Facebook, and Facebook is notoriously hard to search and link so sorry I can't link it, but basically the 5th Fighter Wing sent a notice to the locals that if they hear jets flying at night, do not be alarmed, that's them training, also, do not fly any kites, balloons, or drones without permission. This suggests that the Philippine Air Force investigation team did not find any sign of equipment failure and the 5th Fighter Wing was informally notified of this before the investigation was formally concluded.
There is a plan to buy more Super Tucano, but as usual for the Philippines, there is a long delay between planning and execution. We can find news article dating back to 2021 saying the Philippine Air Force planned on getting more Super Tucano.