That is the most obvious one. But then you cannot even set altimeter and lack of radio for aircraft without INS is a bit setback since you miss radio navigation.
Honestly, I thought prop aircraft do not talk to me and I am not interested in WW2 era at all, but this one is somehow different. It is very cool alternative for helicopters, since you can fly low and slow and enjoy the map, while still being in modern fix wing machine. Its unique combination.
There is also so many possibilities for fictional scenarios and use cases. I can imagine you could load GBU-12s and carry your own designating squad with you to the battlefield, drop them there, and let them lase for you.
It is very sad to hear there is no active development anymore. So much potential. More so that the most important part, the flight mode, seems to be in pretty good shape already.