> Build with what pieces you can find, rather than plan the perfect structure ahead. Improvising keeps the creativity going!

That's a valid perspective. It can be a lot of fun to dig through the bricks and build freely, letting things take shape.

But it's also valid to have a design phase, where designs are crafted (perhaps even very precisely) and to enjoy that part -- perhaps even using some manner of LEGO-oriented CAD. (Or SolidWorks; I won't judge.)

And then: It's OK to find pleasure in following a plan to build a tangible thing in reality. This concept is strongly reinforced by the fact that LEGO sets come with instructions that are organized into simple steps.

One of the joys of LEGO is that it's very inclusively all fine.