As we all know, Adobe Flash is no longer part of the Adobe Creative Cloud. But there is one very useful feature of Flash that should be part of Adobe Illustrator and that is the way that we where able to colorize vectors on Flash.
With Illustrator we can put a color inside an object, but if i want to put some colours into a surface between some handdrawned vectors that crosses I can't do it.

Even the way that we were able to select a part of a vector when they crossed each other.

Those were very practical ways to edit a illustration and should not be discharged and forgotten with Adobe Flash.