Adding 'Gradient Feather' function similar to InDesign would be great.
It makes masking in Ai a lot more convenient.
I would love it if illustrator had a gradient feather tool that worked the same way as the one in illustrator.
At the moment you have to manually set up a gradient with 2 of the same colour with one set to 0% opacity and one at 100% opacity, unless I'm missing something! The one in indesign can be applied to groups as well which is super useful.