Why is embedded help not popular?

I'm wondering why modern help systems are more passive than active? For example, each good guide through something look like this: enter image description here

enter image description here

So why we don't see this directly on website (service provider), but have to search for another guidelines somewhere else?

Looks like Google Adsense Help is more static (with no images or interactivity) rather than active and interactive.

Context Help:

enter image description here

Steps in Help Center:

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Is it a better approach then directly navigate user through interface? And show him at (least once) what buttons to click in order to do something?

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