As you can see there are main problems with flight model ,radar and avionics that are not fixed, flight dynamics , stall parameters ,etc they are not fixed, I do not really care that much about small graphical issues as for me it is more impotent to get as real as possible radar and avionics function, and flight dynamics. And as you know there are some major issues with that.
All what I am saying is to fix this stuff , Finalize Mig-21 and then start working on the new project , that is my opinion. once again no offence just my point of view of situation.