When collection generics are not resolved on reverse the explicit details about particular collection interfaces are chosen to type a Java field are revealed in the UML Property, and in some cases details about specific collections implementations used are also revealed. So in a sense this results in more of a "design" view.
When collection generics are resolved, the explicit details about particular collection interfaces chosen to type a field (as represented by a UML Property) are suppressed, so in this sense it results in more of an analysis view. One can however still get and edit information about the assigned Java "container" class under the Java language properties in the Property specification dialog as shown in the image below.
What really matters is that you choose to either resolve or not resolve collection generics consistently throughout your project.
