I think it really depends on people's personalities. Some people are just naturally curious and want to try lots of different things, so they end up being good at many things. Others might find one thing they really love and just focus on that. So, personality is a big factor in whether someone is well-rounded or just good at one thing.

Upbringing and education also matter a lot. If parents encourage their kids to try many activities, those kids might become well-rounded. But if parents or schools push students to focus on just one thing, they might only get good at that. Also, not everyone has the same chances to try different things, so resources and opportunities play a part too.

Time and commitment are important too. Being well-rounded takes a lot of time and effort, so some people just focus on one thing to get really good at it. It's hard to be great at everything, so people often have to choose where to spend their time.

Culture and society also influence this. In some cultures, people are encouraged to be good at many things, while in others, being a specialist is more respected. Peer pressure and what society expects can really affect what people decide to focus on.