The problem about comparing this to DCS is that MSFS renders the whole world with the cloud while DCS only loads a certain limited map, it is not rendering the entire world like MSFS does. That is why DCS is pretty stable and does not create a lot of issues, it is simply a sim with broken down maps that are limited in size. That is why they are able to achieve so much detail in one given level. As for study level aircrafts, every aircraft in a sim is limited in terms of the simulations of an aircraft systems, frankly because the manufacturers do not want a full replica model in a sim. Take PMDG for example, they are a officially Boeing Licensed Product but have restrictions on what they are able to simulate in a sim, thus you do not get the full simulation of all aircraft system to the real life counterpart. Exact same thing with DCS.
In the end, DCS is more concerned on aircraft models and their simulations while MSFS is more on creating the base sim, and giving the tools to other 3rd party devs to create their own study level aircraft. That is why half of their aircraft that they released are just the bare minimum because they stated that they where not really trying to create study level aircraft and in fact where going to leave it to third paty devs. The fact is, they are trying, it is just to complex for any team now a days to handle, only a select few can do it, trying to update the SDK regularly, providing optimization improvements, giving updates for the world sceneries, maintaining the backend that downloads the photogrammetry for you, all those partnerships as well that download live weather from Meteoblue and the navdata as well.