"It's cool" is a good enough justification to have something in your setting.
Yes."It's hot" also is
>>98955403No.Guns are cool. I don't have guns in my dark ages setting.
>>98955403True, unless you're actually trying to profit from the setting. Then you'll have to kill your darlings.
>>98955403You don't need any justification at all to include or exclude anything.
>setting