I mean, imagine being able to make detailed replicas or things and make them able to function.
like-

• Being able to design pretty good 3D models with basic tools, and make color schemes or
  patterns with only being able to paint each 'part' a solid color.

• stuff on a "CAD"software disguised as a game

• Making those "3D models" function, as intended or realistically*. *even with mediocre physics.

• Learning new math stuff and math functions, and/or basic coding. (if you don't already know some of them.)

• Being able to exploit, fix, and abuse, bugs and imperfections of the "game".

• Innovating and finding solutions to things you didn't ask and didn't know was possible.

.

of course, none of these would have been possible without the all mighty devs who are very kind and treat us as friends.