You got some valid points there KOM.Nausicaa.
But I still think this is a completely different aspect. These mods are literally done by hundreds of people a lot of them taking codes and sounds from other games, changing certain items, which cause problem on other sides.
Oleg didn't have this choice, because there were other priorities, because he could not just implement code or sounds from other games, because he has to see that a simple patch doesn't make it necessary to upgrade your PC, because for example more units in more packed areas suddenly appear on standard-missions or fires with new OpenGL-routine suck up performance.
he also has to see that an effect on one plane doesn't change the effect on another plane and of course if he'd changed the bar in the FW190 a lot of folks would have cried out loudly, demanding various minor fixes on other planes. You can see what people demand here for justification that just a little thing is promised or changed for another "group of fans".
Developing a game for a market is a lot more complicated than changing a few elements for some fans.