This topic, to one extent or another, has been talked about, hashed, re-hashed, and re-resuscitated so many times over the years. Decades even. From many different tangents and perspectives. There are eleventy different "right" ways to do things, and at the same time there are eleventy different "don't-ever-do-this" type of things, because 'reasons'.
Let me add this one little simple point enter the discussion, and do with it what you will:
Where do you store your powder and ammo? WITH your prized possessions, to prevent theft/unauthorized contact and to keep them away from heat/fire OR/
Away from your prized possessions, to keep them away from your prized possessions in case of fire?
Now tell me, does THAT change your question and perspective?