I voted « yes, always »
An official turn of events and background info is essential to a setting IMO. It is a huge part of what defines the setting and set it appart from other campaign settings.
However, I feel the underlying question, while not specifically spelled that way, is whether it is important (or not) to use that official content and if so, in what proportion. There, I would say that no official content should be taken as sacrosanct canon. The devs and authors themselves acknowledge that.
But still, the official info is important, if only to know what you think needs changing. No matter how much you alter a campaign setting, you need to start from something. That something is always important and relevant. It's one thing to mine a setting for inspiration, it's another to affirm playing in the said setting.