Yeah, I love the point where you said forfeiting one for another is better. Trying to pursue two at once is making great mistake because the negative effect will still bounce on the individual.
If one is pursuing a career in the medical field, while not focus and become a great person in that field, while trying two different things at once. It's an effort but that would be a draining one.
Even the scripture tells us that, "No one can serve two masters. Either you will hate the one and love the other, or you will be devoted to the one and despise the other"