why are developers not working on blackscreen games

[prasan@]

i give props to the developers who are building this emulator and the improvement that it showed , i am only telling that if some games gets speed up or some games gets glitch free now it does'nt mean that much to me than having a blackscreen game turn into playble ,and i think those who are making threads about slowdowns or flickring issues in their game should be banned they an post these issues in the game folder of compatibility list , focus should be on what new difference is reached on an unplayble game ,i don't give a damn about online play ,flickering issues ,sound being stuttring first importance should be given on playbility that should be the focal point