They should state what is disallowed by default, as well as why it's disallowed, and they should provide setting-specific options for including things disallowed by default if groups want to include those things.
We can all customize our home games, but are buyers open to purchasing published settings where not only new options are given, but some published options are specifically not given? No elves? No paladins? No fire magic?
I have a semantic quibble that's making it hard for me to answer.We can all customize our home games, but are buyers open to purchasing published settings where not only new options are given, but some published options are specifically not given? No elves? No paladins? No fire magic?
I'm totally fine with settings that "limit" races by never mentioning them. I don't want them to tell me "No gnomes allowed."
Whereas I do.
I want settings to be explicit, not just about what new options they introduce, but about what standard options are not appropriate, be it for thematic, historical, mechanical, or any other reason.
That said, I also don't mind sidebars with suggestions on how an individual DM can include said options despite "canon" if they wish to do so.
I think we're actually rather the same. I didn't say it very well, but what I don't want is for a setting book to tell the DM "no gnomes allowed."