Some people presumably enjoy scientifically dissecting something. Depends on the subject, I would guess. You never took apart things to see how they worked when you were younger?
There are some things a scientific approach is utterly wasted on to be sure, but I can't fathom approaching some things without a sense of curiosity about why X does Y. I mean, discovering the way things operate leads to hilarity when you realize how exceptional or bizarre some things really are. Kind of a "holy shit, they've been doing this in this way for this reason? That's exceptional" thing.
Different strokes for different folks. No one likes a killjoy to be sure, but no one likes that one guy who screeches "STOP HAVING FUN IN WAYS I DON'T LIKE" either.
EDIT: Just kind of an example in regards to how picking something apart is actually MORE entertaining than the completed package - Fallout 3 (and 4 too). If you've played it/them, you're familiar with how its worldbuilding is idiotic and its story is schizophrenic. It's fun to poke at on those grounds alone, but then you get into its nuts and bolts. Things like "Gamebryo is such a crapstack of a game engine that they have to do things like make monorail trams move by turning the tram car into a HAT on an invisible NPC actor that runs really fast." or "Bethesda's engine is so fucking silly that they don't have a way for cars to move under their own power so they push cars along paths with lots of tiny explosions" or stuff like that. The nuts and bolts of Beth games are a goldmine of "oh my god how does this even work lol".