Are you aware that if they followed your model, they would never release anything at all?
There is no such thing as perfect, bug free software, period. Too many variables. And of course new bugs will be introduced when the environment (DCS World) changes. Going back to the single-aircraft-whole-new-game model makes no sense now that we have third parties going into the mix. In fact, it would not make any sense at all because they would need separate teams to support different games. Your thouhgts feel very selfish to me, because the whole suffers.
The current model works, and it will work even better with the new engine, which was conceived from the begginning with this level of modularity in mind.
Wait and see.