Artists can say that, especially if it's John Lennon :) but I'm not sure I can apply it to myself

Well, the blog is called Engineers Need Art.

I think your reluctance comes from a different prioritization. The writer is clearly interested in developing their creativity (and are wildly succeeding!). The project is the means to do that. Continuing on a project even after it no longer is the best use of your time is just a type of sunk cost fallacy.

Why?