Did you not grow up with any sisters? In any case, it's not an objective. There is no assigned quest in the sandbox. You do whatever you wish. No one gives you a quest. There is no scoring except those rules may by people playing in the sandbox together.
No, I don't have sisters, all brothers, but I do have female cousins. My family used to have a rather large sandbox, for us to play when we get together. There were about 25 of us kids, sure the girls like to play kitchen and cooking and us boys play soccer. Cooking sand wasn't fun and playing soccer on sand sucks.
We tried different things; different games but nothing were fulfilling. That was until I came up with the game of build, destroy and conquer. We would divide our self into two teams and each teams would build a large sand castle/barrier by packing sand into a large containers (like making bricks) and stacking them, divide the 50 plus soccer/volley balls allotted to each team among members and prepare limited water bombs. After putting on our swimming goggles we would start throwing balls at the opposing team sand barrier trading blows, once those are half destroyed came the water bombs. The sides with all the team members wet lost. But by that point winning or losing don't matter anymore, we would be exhausted from all of the activities and fun fulfilled, afterward we would just chilled in the swimming pool. From that point onwards, this was what we did when we get together.
I spent years hanging out on MUDs, LambdaMoo, et al. There are an enormous faction of people who enjoy building stuff, who don't neccessarily have to rape, pillage, and destroy it.
Well, MUDs don't normally get full like a sandbox. You got to destroy it at some point if things get full or you want to build better things.
Painters paint, not so they can burn their painting in the end. Sculptors sculpt, not just so they can blow up the statue with an M80. Coders code, because they enjoy solving problems or seeing the result, not because they simply want to delete their program.
What make you think we don't admire at what we build before we destroy it even if the thing only made up of sand? We enjoyed building them, we enjoyed destroying them, we also enjoyed the conquering bit.
Take your coders example, you build your codes by programming, you removed/delete codes that are erroneous or don’t work, to conquer the problem.
What you describe is the subset of people who perhaps grow up to teens or adults who like writing viruses, or going to see monster truck rallys. I feel sorry for you if the only joy you can get in life is from watching shit blow up or destroying what you've created.
Again, it’s a sandbox; I wouldn't have enough sand or space to continue building stuff without destroying it, even if our family sandbox was the size of basketball court.
Curiously you take your stuff this seriously when inside a sandbox as a kid?
Heck even in the sandbox of that Playstation Home, my rules of build, destroy and conquer still apply.
Build -> decorates your space, add people to friends list, etc.
Destroy -> takes stuff down for redecoration, remove non active friends from list, etc.
Conquer -> try to look the most hip/cool/ or whatever your fancy as your goal.
That's the objectives of sandbox, I though of this stuff when I was 6-7 years old, I thought it comes naturally for every kids.
