Add basic contrast/brightness capabilities to adobe illustrator, even powerpoint can do it....
1) Not necessary to incorporate the full photoshop adjustment suite to illustrator, but basic tools like contrast/brightness/nonlinear contrast adjustment would be INCREDIBLY useful.
2) Photoshop is not great for working with large arrays of images (illustrator is better for this) BUT its frustrating that images can't be adjusted side by side once imported into illustrator.
T. Unger commented
Illustrator has a very complex recolor tool with many possibilities. But it lacks the major component of visual adjustment: contrast.
In many tutorials they try to overcome this by increasing saturation and brightness. But that just heightens the color intensity and doesn't come near what contrast is: increasing the difference between light and dark.
It should be part of an illustration app for professionals. I am puzzled as to why Adobe can't work this out. The company Astute did it years ago. But you have to pay a yearly 120 dollars just to get this effect.
I would say: get your best man to fix this. Customers will be delighted once they will start using contrast afjustment in their artwork.