A website 'design' is obviously created with an 'escalation of attention' in mind (to support a broader escalation of commitment), and the image demonstrates the predictability of the mind of a user when they land on any page. A user will first scan for important information, then second-tier information, and so on, before searching the periphery.
Any interference-based content in your post content will steal attention away from the standard and more intuitive design flow, particularly if flashy styling is applied... and that's kind of the point. Interference messages creates an incentive to navigate a particular funnel pathway.
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