There is a trend to pair the bobbin thread with it's mate on the spool or cone. It's not an issue until the pairing is done with rubber bands. The outcome on this is weakened areas where the rubber band is/was or broken thread while sewing or in the seam of the garment.
The effect is much the same as placing a needle in the thread to hold the needle....something that should not be developed as habit.
In the end, always best to do it right the first time. Short cuts are best left to clipping curves and corners.
Whichever method you use and choose to call it, remember I wish you success and inspiration in all you do, today and always!