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You have a valid point, but most members who have advanced to a grille block also have instrumentation like a ScanGauge that allows them to constantly monitor coolant temperature, a lot more accurately than the stock gauge can display. For example, on my Civics dash temp gauge I cannot tell the difference between 185 and 210 degrees.
This is important because you should know at what temp. your fan will turn on. In my Civic it's around 206 degrees. If I had a grille block I would know if it was blocked too much if my temps were always around that mark, and the fan would be trying to keep them under control. Many also use a fan light in addition to constant temp monitoring, and this way you know exactly when the fan is on.
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