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Static electric created by a vacuum is more a myth to promote canned air sales. If moving air created static electric damage, then canned air also creates that damage.
Best is to use a vacuum with a low airflow setting. Then critical jumpers or other important setting are not 1) sucked off (removed) and 2) those default setting lost.
Dust is not really a problem. Computers if properly designed work just fine in summer heat even with balls of dust. But dust problems become severe if using too many chassis fans. One chassis fan is more than sufficient for most every computer. Too many fans only create massive dust problems.
Dust is only a serious problem if it completely clogs narrow ducts in heatsinks. Even if half obstructed, dust is not a problem. But completely clogged ducts mean no airflow and no cooling. Maybe use a toothpick to loosen that packed dust. Then remove with a vacuum set to gentle airflow.
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