In this day and age scanlines are a no go, but I can see why people would like to add that authenticity to their own displays when using WinUAE. It doesn't bother me one bit, as I like my GFX to look as sharp and as detailed as possible for you, the people to enjoy
It's the way I am, I think
EDIT: Take a look at my lovely AMP Logo which is half perfect
and half scanlined