Well that is a falacy. It does not mean that the weapon system: missile + plane's WCS is uncapable of more complicated operation that a flying dart.
There is enough available data on the internet, ranging from science papers of the R27 guidance down to the manuals, etc. which could provide enough information for the model. If anything, all hard data points to DCS being in poor state in current simulation of such systems.
That being said.. it is a welcome news to read that there is a roadmap to improve the simulation. :thumbup: