When I first started quilting, I tied all of my quilts. They were just simply scrap squares joined to make a top, polyester batting and a sheet on the back. I frequently used yarn for ties and some yarn was better than other types. Over time, the batting shifted (probably ties were too far apart), some of the ties undid or even pulled out. By the time this happened, the quilt had been very well used and was starting to wear out. I then combined some SITD quilting with ties made of perle cotton and this lasted even longer. It's your quilt, quilt it in any way you please.