Can't Unpublish Fields Error: Cannot unpublish row id 44 because: System fields publish state cannot be changed!

So I just downloaded/installed the CB. I go into the Fields area and am trying to remove fields that are not necessary and am bombarded with the error:

Cannot unpublish row id 44 because: System fields publish state cannot be changed!

Why? If I don't need it, why can't I unpublish it? Sounds like a bug.

[mod note: moved our of potential bug area because of this www.joomlapolis.com/forum/147-potential-bug/226964-read-before-posting ]

This is not a bug - this is by design.

What fields do you think are not necessary?

Well I don't need:
canvas
formatname, since I already have firstname and lastname fields
middlename
pm
acceptedterms
avatar

Plus, we have users that share the same emails but use different username/password. So do I have to go to the database to make sure the 'email' field is set to not be unique?

So is there a way to remove these fields without having to modify the database?

toad78 wrote: So is there a way to remove these fields without having to modify the database?

No = those fields are meant to be there - if you remove from database you will run into problems.

Thank you, nant.

So what makes them so necessary? I'm trying to understand the structure of CB that makes these fields necessary.