Why can’t a weblog be assigned to more than one custom field group?

Supposing I have a weblog called ‘News’ and I want it to have the following custom fields:

Summary
Body
Extended text

Now suppose I have a weblog called ‘Projects’ and I want it to have the following custom fields:

Summary
Body
Extended text
Image

It seems I have to create 2 custom field groups. The field group for ‘Projects’ would need to have a duplicate of the ‘News’ fields, plus one extra field called ‘Image’.

This seems very inefficient as far as the database is concerned, because under the hood it creates a new field in the database tables for each custom field you create.

What I really want to do is assign the ‘News’ weblog to the ‘Default Field Group’, so it gets the standard 3 fields and assign the ‘Projects’ weblog to BOTH the ‘Default Field Group’ AND the ‘Projects’ field group so it gets the standard 3 fields PLUS the ‘Image’ field.

It seems really pointless to keep duplicating fields just because a weblog can’t be associated with more than one field group.

Well, to be picky, you assign field groups to weblogs, not weblogs to field groups .

But why not have one field group with all 4 fields and just use it? You don’t have to use the image field if you don’t want to.

That way you only have the one group to worry about.