[Q] Oval / Rectangle Tool and Oval / Rectangle Primitive Tool

Okie since I’m new to Flash so I have some questions for you guys. Here is the thing, I do know how to use the oval / rectangle and oval / rectangle primitive tools in the tool bar and find them quite useful, but one thing I find confusing is. A oval / rectangle primitive object can be edited later but the oval / rectangle can’t. So the point is,how do we use them properly ? when to use ? Why does Adobe Flash still keep the oval / rectangle tool in their product instead of removing them with the oval / rectangle primitive tool ?