I still don't understand this argument, Valve is not a studio that makes realistic games. Its not beneficial for them to build an engine around realism when every game they make is stylised, nor is that the focus in s&box. UE4 or Frostbite are examples of engines built around realism and have the tools(especially optimisation wise) for realism, Source 2 just isn't there yet because it never had to be.
Also, literally every other server is going to be using bf2 assets, and if the do use CGI they will still be using ported assets from gmod, they wont be anywhere near the quality of our server. We essentially have the workload of a small game studio at this point, were looking to build something that we can be proud of, as well as further our skills as developers. Taking content from another game just ain't is chief.
We have a tonne of awesome things planned game-mode, gameplay, customisation and art wise and I personally think it would be a shame to diminish that with ported assets.