Oddly Wired
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focalism

You give too much weight to a specific detail.

When evaluating life satisfaction, people tend to focus on a single piece of information while ignoring the larger context.

The original study by Schkade and Kahneman focused on regional differences (weather) rather than all complex decision-making scenarios.

Nothing is as important as you think it is while you are thinking about it.

Where this comes from

Study
Schkade and Kahneman, 1998, Psychological Science
What the check found
The core concept is correct, but the claim generalizes the finding (originally specific to life satisfaction) to all 'complex situations' without noting the original context.
Confidence
Solid, with limits
focalismfocusing illusionperception

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.