Thread Color for Machine Quilting

I’m learning to use your quilting methods on my longarm machine. They are very clear and well done, thank you so much. My question is: You suggest always using the same thread on the bobbin as well as the top to eliminate the bottom thread showing up at any time on the top, and as well you suggest changing threads on top with the different color changes of the piecing. It all looks great, but does that mean we change the bottom thread each time we change the top thread?

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