Some valid points, let's add a few more just for fun.
Engines that don't run forever and a day at full RPM whilst damaged. Engine modelling seems very forgiving compared to other sims I've played.
Higher chance of faulty munitions and sub-standard fuel/engine quality for late war axis fighters.
Field modded (bored out, tuned, etc) engines for both sides.
Default application to add kill markings to a skin
I'll leave it at that.