I can relate to your concern in another area. I do zendoodling/zentangling and I found myself liking one pattern I drew and wanting to make it over and over. I became concerned also, as that is not the point of it all ( I told myself) and almost ruined my pleasure in the drawing.
Then I realized the true point in doing anything we do for fun, ie: quilting, drawing, etc. is for the joy and pleasure we get from it, and if drawing the same design over and over made me happy, or in your case making bargellos, then that is exactly what we should do!!!
When the time comes for us to do something else, we will know it and move on!
So indulge yourself as I intend to and have fun!
Hugs and smiles