I'm new to EPiServer CMS and currently in the process of specifying how we'd like to have EPiServer set up for our intranet. From what I've read it looks like we need to choose between whether we want to use the 'fetch data' feature with all of our page types or set some additional mandatory fields.

Of course, we want both the option to use 'fetch data' with any page type and we want to be able to specify some mandatory fields (over the generic ones that are required for all page types).  Especially, after the helpful article Simple Modifications to the Editor Interface can Help Editors Daily Work also mentions using mandatory fields as an option for helping editors.

• Do we have to choose between fetch data or mandatory fields?  
• Is it possible for EPiServer CMS to recognise when fetch data has been selected and differentiate between the mandatory fields set by the administrators and those that are generic, and then ignore those set by the administrators as not required in that instance?
• If it's not possible to have both, how do you decide when to choose fetch data or mandatory fields for each of your page types?