For me it’s not that hard to believe in the developers regarding their announces of additions and improvements that may come to the DCS World core engine. Developing a combat flight simulation in that scale surely requires covering of many real life aspects to get the most immersive simulation out of it and that requires time, work, etc… as well.
I’m sure they are working on all these things at least they try to and of course things might change which reduce, speed up or even stop the development of new additions to DCS.
You can’t expect that everything a perfect flight simulation needs to offer will be worked on or even finished one day when there are plenty of other things left that need to be done which seem to be more important to work on, for example the merge of both versions or the continuing development of aircraft modules.
Now regarding developing these aircraft, they could also let the 3d parties do all that stuff but without ED updating the main core sim with A/G-, A/A radar and many other things RAZBAM wouldn’t even think about the addition of on an AV-8B+ with A/G radar. I think…
I’m not really that long into DCS or flight sims at all but for what I have expierenced so far is that for an almost 10 year old flight simulation that is still being worked on, developers have made very good progress so far.
And I’m sure ED and the 3d parties do their best to push up the quality of DCS World.