My DS aged 10 doesn't have any real hobbies.
He does gymnastics twice a week, but has zero interest in training or competing - not even at the 'end of term' shows they do each year. He's done a couple of other sports, but didn't want to carry them on and he's actively dislikes team sports. He is very sociable, he'd happily spend all his free time hanging out with his friends, and he'll do pretty much anything if it's with other children. His main pastimes are Ipad (games and 'doing research' - anything from slime making to animal docs). He watches lots of TV - all factual: he loves anything science / tech / nature / history, both children's programmes and adults / family docs. He reads a lot when he's used up all his Ipad / telly time. He happily joins in family activities - bike rides / football with his dad and little bro, cooking, trips to anywhere - even the supermarket - and he loves coming camping with us - he usually makes new friends on the first day and we hardly see him for the rest of the trip!
It all looks good, I know. But he has no drive or interest in 'getting better' at or learning anything. Doesn't want to play an instrument, doesn't want to improve at his sports, doesn't want to get better at chess, doesn't want to learn to code or build a robot etc. He definitely wants to be good at all these things (and gets frustrated when he gets beaten by his younger brother!), but doesn't want to practice. He's the same in school: doing well overall, but really he's doing the bare minimum and coasting on the fact that he's clever and picks things up quickly. If he doesn't get it first time round, he has to be really pushed to sit down and learn it properly.
We had a crappy day yesterday (public holiday). His little brother was off practising his football with DH, then asking to be taken on bike ride, and just wanting to do stuff. DS1 just seemed to be moving from one time-passer to the next and had no interest in doing anything constructive. His attention span is very short, he gets bored very easily and he was whinging all day about being bored, when could he go back on the IPad, could he watch telly... I just wanted him to do something less passive!
My AIBU is a bit devil's advocate: I really want him to have a hobby, something that engages him and that he wants to get better at - and which isn't Fortnite! But when I look at myself, I was very similar as a child! I read constantly - and the closest I had to a sport / hobby, was banging a tennis ball off a wall and trying to rally for as long as possible! And now as an adult, I don't do anything improving or constructive - I read, I watch telly - easy pastimes, as I don't generally have the time / energy / committment / money to take up anything else. So probably I'm projecting my own thoughts onto him... which isn't fair.
So whaddya think? Is it ok for DS to not have any proper 'hobbies' and for him to just pass the time in his spare time instead?