1. - Did it fly in squadron force for the US an ally or our enemies during WW2?
2. - Did it engage in combat actions, and did it shoot down enemies of the country flying it?
Unlike the P51H, F7f, and F8f, the P63 flew ground attack missions and shot down a single Japanese aircraft in 1945. Maybe the single kill recorded is a Hitech no go, or wait on the back burner number. There are arguments over the number of kills achieved by Ta-152 pilots with 7 being the most common number. What is forgotten, the existing Ta-152 upped into very packed unfriendly sky's during 1945 loosing about 4 to enemy air activity versus the P-63 flew in a milk run environment.
That may have had more influence on Hitech's decision about including the Ta-152 to the game, even with less than 100 able to fly missions.