It comes down to your definition of hobby. For instance some people consider listening to audio books as "reading books" or riding e-bike with hardly any pedaling as "cycling".

I can assure you my "hobbies" (not sure whether reading/discussing about tech, following news, watching movies, playing (video) games, travelling/hiking, ocassionally playing table tennis or minigolf qualifies as hobbies) are pretty much same as they were before smartphones, I just have much less time with work and kids than I used to have, though at least trying to incorporate kids where possible like table tennis, minigolf, hiking, playing (video) games.