My feelings about borders often depends on the quilt size- is it the size you want it to be? If so, no border is necessary. If it needs to be larger- add borders. Or ( which is not the case with your lovely quilt) if there are many seams along the edges I might add a border just to hold everything together. If I don’t want toborder it I stitch a * stay stitch) all the way around the top so those seams don’t pull apart .
i love the colors of your quilt!