My son gets the sets, builds the one thing, then starts heavily modifying it. Eventually pieces from other sets will be incorporated into this set and it into o

My son gets the sets, builds the one thing, then starts heavily modifying it. Eventually pieces from other sets will be incorporated into this set and it into other sets and eventually the Death Star has become a castle. So, it’s more of a mindset thing than a LEGO thing. If you insist that the one thing is all the set can become, that is fine, but it can also become many other things if you let it go.