A moderate level of impulsivity helps you be decisive and react quickly. It becomes problematic when it interferes with achieving goals, harms relationships, or affects health (e.g., a tendency toward risky driving or spontaneous purchases).
Yes, studies show a moderate link. Impulsive people often have "fast" thinking and a willingness to take risks, which is useful in creative professions and startups. However, without strong planning to balance things out, such ideas often go nowhere.
High impulsivity often leads to outbursts of anger or thoughtless words that the person later regrets. Understanding your BIS-11 level helps you realize that impulsive reactions are rooted in how your nervous system works, and they can be managed with "pause" exercises between stimulus and response.
This is related to "cognitive impulsivity." A person quickly gets excited about a new idea, but as soon as the novelty fades, the brain stops releasing dopamine. The Barratt test captures this drop-off in attention on long-term projects.