Yes perking the planes would make people fly a tad bit more timidly than they already do. However the plane would not see as much usage. As you can tell from the relatively low # of kills in the F4U1c compared to the Yak3, Spit16, La7, 190D, and P51D. Even a temp isnt used as much. IE, its much less fun/harder to fight 5 Yak3s and La7s tracking you down off the base and ganging you every sortie, than it is fighting a single F4U1C.
Also, the F4U1C is much better than the La7 for a lot of reasons though it's not a plane that you can just hop in off the base and jump into furballs expecting you can escape the fight easily like a Yak3 and La7. The hispanoes are simply amazing and will destory most planes after a quick overshoot which makes it so much more deadlier than the F4U1A for that very reason. In War, the faster you can kill the guy the better, this avoids you from getting picked chasing them, which happens a lot to 50 Cal flyers like the P51 and F4u1A/D. Quick kills with 4 cannons avoids you a lot of hassle and E loss. The Nik is much slower. Which is why it's not perked. Note how the Yak3, 190D, and La7 have cannons too. One ping is a part of your plane damaged where as 50cals don't do much unless a lot hit at the same time and place. Cannons matter!
The D is actually my favorite F4U.