So how do you know that your low-level construct is on the path to where you want to be? It's kind of growing the grass and let people walk on it, then decide

So how do you know that your low-level construct is on the path to where you want to be? It's kind of growing the grass and let people walk on it, then decide where to put slabs on the paths. Anyway I bet you are considering the cost of making changes. That cost is different for different languages.