A low 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 control from the "planning scale," such ideas often remain unfulfilled.
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 sharp reactions are a feature of the nervous system that can be managed through "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 highlights this deficit of attention toward long-term projects.