I also feel frustrated or jealous that some people are able to find one particular thing they like and keep doing that for a long time, getting better and better, while I learn little bits of everything all the time without actually mastering anything.
However, as you said, people are unique, and if you get bored focusing too much on one thing, then focusing on one hobby for too long won't help you achieve much, because you're not always gonna be in the mood to do something productive.
Society still thinks that becoming a master at something is the way to succeed, and while that has its benefits, knowing more things and being able to create a lot of stuff using all the knowledge you have is just as important and useful.
Until people get used to this and until they realize that being a jack of all trades is, in a lot of cases, as useful as being a master at something, we'll just have to constantly explain people that being interested in more than one thing is good and live feeling frustrated from time to time whenever we see someone chasing their one true passion.