Being interested in something for its own sake beyond an "average" interest is extremely typical.
Our brains are wired to incentivize this interest via the delivery of pleasurable feelings, determination, and motivation. These experiences shape our personality and inform future higher-than-average interests. This is a good feedback cycle, and not something to be lumped together with other facets of personality.
Implying otherwise suggests that people are weird for liking things that they like.
Obviously everyone is interested in things, but it is a matter of degree. Being extremely deeply passionate about something, especially if it is something really unpopular and obscure but complex and time consuming that has no real social or other benefits, is not common among neurotypical people. However, for example, I have ADHD and hyperfocus on niche hobbies and interests where I can barely think about anything else, sometimes for months.
From my observations, most extroverted and otherwise neurotypical people don't have obsessive interests they pursue deeply entirely on their own. When they have hobbies they enjoy a lot it is often the social community around the hobby as much as anything else that is motivating them to stick with the hobby.
Being interested in something for its own sake beyond an "average" interest is extremely typical.
Our brains are wired to incentivize this interest via the delivery of pleasurable feelings, determination, and motivation. These experiences shape our personality and inform future higher-than-average interests. This is a good feedback cycle, and not something to be lumped together with other facets of personality.
Implying otherwise suggests that people are weird for liking things that they like.